OPALA, Justice.
The dispositive issue on certiorari is whether the appellate court’s earlier pronouncement in
Fent I
operates as a
bar against relitigation
before the Oklahoma Corporation Commission [Commission] of these issues: (a) the district court’s cognizance of the customers’ claim against Oklahoma Natural Gas Company [ONG], (b) the controlling effect of the Commission rules on the parties’ liability for the repair and maintenance of the landowners’ gas pipeline and (c) the construction and applicability of Commission Rule 6a to the customers’ pending district court claim? We answer in the affirmative.
I
THE ANATOMY OF LITIGATION
Margaret B. and Jerry R. Fent [Fents], appellants, live in a house upon a lot platted in 1922. When the house was built, gas meters were usually installed in a protected location, either inside the house, garage, or within some other sheltering structure. At the time the Fents purchased the house in 1966, their gas meter was located in the basement. The Fents and ONG had no written agreement specifying either the location of the gas meter or the point where gas consumption would take place.
On June 6, 1988 the Fents reported the presence of natural gas odor in their backyard. A leak was located in the gas line at a place between the meter in their basement and ONG’s easement behind their home. ONG disconnected gas service to the Fents’ home, removed the properly-working gas meter from their basement and replaced the original indoor meter with a new one which came to be installed in the backyard utility easement area. Before ONG would restore gas service, the Fents were required (a) to repair a ten-inch gap in the basement pipe
line left by ONG when the old meter was removed and (b) to install another yard line to connect with the new meter.
Fent I Litigation
Upon ONG’s refusal to reimburse them for the
replacement yard line
and for the
repair of the gap in the piping
where the original meter had been, the Fents brought a district court suit against ONG on October 6, 1988.
ONG moved to dismiss the action, contending that the Commission had
exclusive jurisdiction
over the subject matter and that the Fents had
failed to state a claim
upon which relief could be granted. The trial court
dismissed
the Fents’ amended petition (a) for
lack
of
jurisdiction
and (b) for
failure to state a cause of action.
The Court of Appeals
reversed
the nisi prius decision, remanding the case for further proceedings.
The appellate tribunal held that the trial court
erred
(a) in ruling that it was without jurisdiction of the action (since the Commission is
not
a court of general jurisdiction with power to adjudicate claims for money damages from a public utility’s negligent acts) and (b) in concluding the Fents failed to state a cause of action (because, under the terms of Commission Rule 6a [Standards for Gas Service], ONG was responsible for the maintenance of the pipeline up to the output side of the meter in the Fents’ basement and was under a duty to repair the gap in the basement line as well as the leak in the yard line). The cause so remanded remains pending before the district court.
Fent II Litigation
While the district court action was pending on remand, ONG filed an application with the Commission requesting (a) an interpretation of the applicable rules and (b) an order that ONG
customers
are responsible for installing and maintaining all piping between the customers’ property or curb lines and the customers’ point of consumption, regardless of the meter’s location upon the premises. The Fents, who were parties to the agency proceeding, objected to ONG’s quest, asserting that (a)
their dispute with the utility
had been resolved by
Fent I
and (b) the Commission lacked power to decide the issues placed in controversy.
The administrative law judge [ALJ], who heard the case, concluded that the Commission had jurisdiction to hear the dispute and recommended that ONG be declared responsible for maintaining yard lines located away from utility easements.
The Fents, ONG and the Commission’s Public Utility Division [Division] all appealed to the Commission
en banc.
The utility customers represented their objection to the Commission’s cognizance, arguing that the issue sought to be tendered had been settled by
Fent I.
ONG excepted to certain ALJ findings and recommendations on the grounds that they were contrary to the established rules’ interpretation as well as unsupported by evidence.
The Commission ruled that it has jurisdiction and the gas utility
customer
is financially responsible for the installation, maintenance, repair or replacement of the gas yard line— the line extending between the utility easement and the premises served — regardless of the meter’s original location away from the utility easement.
The Fents appealed, urging that
Fent I
had settled ONG’s liability for the costs of the re-installation. In support of their position they direct us to some excerpts from
Fent I
which indicate that under Commission Rule 6a ONG is responsible for the maintenance of the Fents’ gas pipeline as well as for the repair of the ten-inch gap left in the aftermath of the removal of the meter and of the leaking gas pipeline section. The Fents argued that the appellate court pronouncement bars ONG from relitigating its liability before the agency forum. The Court of Appeals held that (a) no language in
Fent I
raises a barrier to the Commission’s consideration of ONG’s application and (b) the agency has jurisdiction to interpret its own rules. When called upon to construe an administrative rule, the opinion explains, courts generally show great deference to agency interpretation of its own language. Moreover, the appellate court observed, the Commission’s ruling would be useful in the post-remand district court proceedings directed by
Fent I.
II
THE RELITIGATION BAR
The Fents assert that in
Fent I
the Court of Appeals determined that (a) the trial court had
subject matter jurisdiction
of their private dispute with ONG, and (b) their petition had
stated a claim upon which relief could be granted.
In resolving the latter issue, the Fents urge, the appellate court settled ONG’s liability, under the terms of Commission Rule 6a, for the maintenance and repair of their gas pipeline.
ONG and Commission counter by explaining that the issues in
Fent I
and
Fent II
are different. In
Fent I,
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OPALA, Justice.
The dispositive issue on certiorari is whether the appellate court’s earlier pronouncement in
Fent I
operates as a
bar against relitigation
before the Oklahoma Corporation Commission [Commission] of these issues: (a) the district court’s cognizance of the customers’ claim against Oklahoma Natural Gas Company [ONG], (b) the controlling effect of the Commission rules on the parties’ liability for the repair and maintenance of the landowners’ gas pipeline and (c) the construction and applicability of Commission Rule 6a to the customers’ pending district court claim? We answer in the affirmative.
I
THE ANATOMY OF LITIGATION
Margaret B. and Jerry R. Fent [Fents], appellants, live in a house upon a lot platted in 1922. When the house was built, gas meters were usually installed in a protected location, either inside the house, garage, or within some other sheltering structure. At the time the Fents purchased the house in 1966, their gas meter was located in the basement. The Fents and ONG had no written agreement specifying either the location of the gas meter or the point where gas consumption would take place.
On June 6, 1988 the Fents reported the presence of natural gas odor in their backyard. A leak was located in the gas line at a place between the meter in their basement and ONG’s easement behind their home. ONG disconnected gas service to the Fents’ home, removed the properly-working gas meter from their basement and replaced the original indoor meter with a new one which came to be installed in the backyard utility easement area. Before ONG would restore gas service, the Fents were required (a) to repair a ten-inch gap in the basement pipe
line left by ONG when the old meter was removed and (b) to install another yard line to connect with the new meter.
Fent I Litigation
Upon ONG’s refusal to reimburse them for the
replacement yard line
and for the
repair of the gap in the piping
where the original meter had been, the Fents brought a district court suit against ONG on October 6, 1988.
ONG moved to dismiss the action, contending that the Commission had
exclusive jurisdiction
over the subject matter and that the Fents had
failed to state a claim
upon which relief could be granted. The trial court
dismissed
the Fents’ amended petition (a) for
lack
of
jurisdiction
and (b) for
failure to state a cause of action.
The Court of Appeals
reversed
the nisi prius decision, remanding the case for further proceedings.
The appellate tribunal held that the trial court
erred
(a) in ruling that it was without jurisdiction of the action (since the Commission is
not
a court of general jurisdiction with power to adjudicate claims for money damages from a public utility’s negligent acts) and (b) in concluding the Fents failed to state a cause of action (because, under the terms of Commission Rule 6a [Standards for Gas Service], ONG was responsible for the maintenance of the pipeline up to the output side of the meter in the Fents’ basement and was under a duty to repair the gap in the basement line as well as the leak in the yard line). The cause so remanded remains pending before the district court.
Fent II Litigation
While the district court action was pending on remand, ONG filed an application with the Commission requesting (a) an interpretation of the applicable rules and (b) an order that ONG
customers
are responsible for installing and maintaining all piping between the customers’ property or curb lines and the customers’ point of consumption, regardless of the meter’s location upon the premises. The Fents, who were parties to the agency proceeding, objected to ONG’s quest, asserting that (a)
their dispute with the utility
had been resolved by
Fent I
and (b) the Commission lacked power to decide the issues placed in controversy.
The administrative law judge [ALJ], who heard the case, concluded that the Commission had jurisdiction to hear the dispute and recommended that ONG be declared responsible for maintaining yard lines located away from utility easements.
The Fents, ONG and the Commission’s Public Utility Division [Division] all appealed to the Commission
en banc.
The utility customers represented their objection to the Commission’s cognizance, arguing that the issue sought to be tendered had been settled by
Fent I.
ONG excepted to certain ALJ findings and recommendations on the grounds that they were contrary to the established rules’ interpretation as well as unsupported by evidence.
The Commission ruled that it has jurisdiction and the gas utility
customer
is financially responsible for the installation, maintenance, repair or replacement of the gas yard line— the line extending between the utility easement and the premises served — regardless of the meter’s original location away from the utility easement.
The Fents appealed, urging that
Fent I
had settled ONG’s liability for the costs of the re-installation. In support of their position they direct us to some excerpts from
Fent I
which indicate that under Commission Rule 6a ONG is responsible for the maintenance of the Fents’ gas pipeline as well as for the repair of the ten-inch gap left in the aftermath of the removal of the meter and of the leaking gas pipeline section. The Fents argued that the appellate court pronouncement bars ONG from relitigating its liability before the agency forum. The Court of Appeals held that (a) no language in
Fent I
raises a barrier to the Commission’s consideration of ONG’s application and (b) the agency has jurisdiction to interpret its own rules. When called upon to construe an administrative rule, the opinion explains, courts generally show great deference to agency interpretation of its own language. Moreover, the appellate court observed, the Commission’s ruling would be useful in the post-remand district court proceedings directed by
Fent I.
II
THE RELITIGATION BAR
The Fents assert that in
Fent I
the Court of Appeals determined that (a) the trial court had
subject matter jurisdiction
of their private dispute with ONG, and (b) their petition had
stated a claim upon which relief could be granted.
In resolving the latter issue, the Fents urge, the appellate court settled ONG’s liability, under the terms of Commission Rule 6a, for the maintenance and repair of their gas pipeline.
ONG and Commission counter by explaining that the issues in
Fent I
and
Fent II
are different. In
Fent I,
they urge, the reviewing tribunal was called upon to determine whether the district court erred in
giving ONG summary judgment
for want of subject-matter jurisdiction. According to ONG, the appellate court neither interpreted the Commission rule now in issue, nor did it decide that the Fents’ claim was governed by any rule; it simply concluded summary judgment could not stand because there were fact issues to be tried. ONG adds that its sole purpose in bringing this proceeding before the agency was to assist the district court in identifying the rules that govern public utility liability in contest between these parties.
A.
ONG’s Argument For Treating
Fent I
As Summary Judgment’s Reversal That Settles
No More
Than The Presence Of Fact Issues To Be Tried Must Fail Because Post-Appeal Construction Of The Meaning And Effect Of The Deci-sional Process On Review Is Governed Solely By The Face Of The District Court’s Judgment Roll Viewed Together With The Appellate Pronouncement
In support of their position that in
Fent I
the dismissal quest was treated as one for summary judgment under 12 O.S.Supp. 1984 § 2012(B),
ONG and the Commission appear to rely on evidentiary material tendered to the district court in its decisional stages. These materials were
not
incorporated into the appellate record before us. But even if they had been included, we could not consider them in pronouncing what was settled by
Fent I. Evidence lies outside the
judgment roll of an
action,
Post-appeal construction of
Fent I’s
meaning and effect must be garnered solely from the face of the district court’s judgment roll viewed together with the appellate pronouncement in that case.
Once a ruling has become final, either for want of an appeal or, as in
Fent I,
in consequence of an appellate court’s decision, any controversy over the meaning and effect of that decision must be resolved by resort solely to the
face of the judgment roll.
The court’s inquiry into a judgment’s meaning cannot extend beyond the instruments that are comprised within the record proper
of the case. Proceedings
dehors
the judgment roll, i.e., those not apparent from its four corners, may not be examined. There can be
but one appellate review
on the
full transcript of trial proceedings.
To provide support for its
summary judgment
theory, it was incumbent upon ONG to make the
entire
judgment roll in
Fent I
a part of the record in this appeal.
This the utility did not do.
For ascertaining what actually stood adjudged in the earlier lawsuit or for identifying the issues actually barred from relitigation,
we must hence look here to the Court of Appeals’ opinion in
Fent
I.
Fent I
described (a) ONG’s quest as one
“to dismiss”
the Fents’ petition and (b) the district court’s ruling as one which
“dismissed
Appellants’ amended petition.”
That characterization is binding on us here. A motion to dismiss for failure to state facts upon which relief may be granted tests the pleading’s sufficiency to support a legally cognizable claim.
Even if we assume that
Fent I
did
reverse a summary judgment rather than a dismissal order, our view of its impact on the agency process would not be different. ONG’s attempt to hale the Fents before the Commission amounts to an impermissible collateral attack on
issues settled
by
Fent
I— issues that are barred from agency relit-igation by the doctrine of issue preclusion.
See
Part 11(B) and (C),
infra.
B.
In Post-Feraf
I
District Court Proceedings All Issues Decided In
Fent I
Are Protected From Relitigation By The Settled-Law-Of-The-Case Doctrine
The Fents argue that in
Fent II
the Court of Appeals overlooked and ignored the
issues settled by Fent
I — (a) the district court’s jurisdiction over their claim and (b) ONG’s liability for the maintenance and repair of the gas pipeline in their backyard. This settled law of the case, the Fents urge, prohibits relitigation of the same issues before the Commission. We view this argument as cast in overbroad terms.
The
settled-law-of-the-case doctrine
operates to bar relitigation
in the same case
of issues once decided by an appellate opinion.
Post-Fent I
proceedings
in the district court
must
indeed
be governed by the law settled in
Fent I.
Other principles of law, which will be discussed later in this opinion, govern the restraint imposable by
Fent I
on the Commission.
C.
In
Post-Fent I
Proceedings Before The Corporation Commission Issues Decided In
Fent I
Are Protected From Relitigation By The Principles of Collateral Attack And Issue Preclusion
In
Fent II
the Commission stands bound by
Fent I
to the very same extent the district court would have been had it been proceeding in the aftermath of an agency case that stood then in the very same procedural posture.
Under the doctrine of issue preclusion (or collateral estoppel),
once a court has decided an issue of fact or law necessary to its judgment, the same parties or their privies may not relitigate the issue in a suit brought upon a different claim.
The principle of issue preclusion applies with equal force to jurisdictional as well as to nonjurisdictional questions. It operates to bar from relitigation both correct and erroneous resolutions of jurisdictional challenges
but it cannot be made binding on anyone unless the party against whom the earlier decision is interposed had “full and fair opportunity” to litigate the critical issue in the earlier case.
No more than a
single opportunity
is afforded by law to litigate a disputed jurisdiction of a tribunal. We must hence look to
Fent I
for the
preclusive effect
of that opinion under the teachings of issue preclusion.
The Issues Settled By Fent I
Fent I
settles three issues. It establishes that (a) the district court
has
cognizance of
the Fents’ claim; (b) the Commission rules
govern
the parties’ liability for the repair and maintenance of the gas pipeline on the Fents’ premises;
and (c) Rule 6a applies to the Fents’ claim and its construction is not inconsistent with ONG’s liability. None of these issues can now be relitigated in a collateral proceeding before the Commission.
The Fents assert that in
Fent I
the appellate court
also settled the issue of ONG’s liability
under Commission Rule 6a. For support of this contention they direct us to certain statements in the opinion.
For the reasons to be explained, we reject their notion of settled liability.
Liability is not generally established
sans
judgment.
While Fent I
may have addressed some of the ingredients or elements of liability, it did not decide the ultimate issue. The record does not show that the facts were either stipulated at nisi prius or settled on appeal.
The case was remanded, not with directions to enter judgment for the Fents, but with instructions to adjudicate a claim found to be cognizable in the forum whence it came.
The statements the Fents rely upon as conclusive of ONG’s liability merely announce a legal principle to be applied on remand
after
the facts have been resolved. When, on reversal, a cause is remanded for trial, it returns to nisi prius as if it had never been decided — save only for the “settled law” of the case.
ONG stands barred by issue preclusion from relitigating before the agency any settled
issue that may affect the Fents’ pending distHct court claim. Only the latter court
has cognizance to proceed with that action. The Commission’s input into the de-cisional
post-Fent I
process must await and stand dependent upon the district court’s willingness to entrust the agency with reference of some yet-to-be-settled issue by utilizing the doctrine of primary jurisdiction.
The Commission’s Exercise Of Power To Settle Issues Decided In Fent I Constitutes An Impermissible Collateral Attack
Judicial acts of the district court
are protected from collateral attack
in the same manner and with the same force as are Commission orders.
The law’s protection against an impermissible collateral attack prevents both the district court and the Commission from encroaching upon each other’s jurisdiction by entertaining inquiries into issues that stand decided by the other tribunal.
A collateral attack launched before the agency on a district court order, like one made in the district court on a nonfaeially void Commission order,
is impermissible. This is so because such attack is clearly intended to question, avoid, defeat, or evade another tribunal’s facially valid decision, or to deny its force and effect, in a manner not authorized by law.
The Commission’s exercise of power to settle issues already decided in
Fent I
amounts to an impermissible collateral attack upon rights adjudicated by
Fent I.
By assuming cognizance of issues settled in
Fent I
and still
sub judice
at nisi prius on remand, the Commission also placed itself in an intolerable position of conflict with the earlier-exercised cognizance of the district court.
The latter tribunal is entitled to proceed to final adjudication free of agency interference. It may, if it so desires, refer for agency resolution under the doctrine of primary jurisdiction
some
stiR-unsettled
issues within the Commission’s competence.
SUMMARY
Once an issue has been reached and decided, the doctrine of issue preclusion operates to bar its relitigation in the same as well as in some other forum. Because
Fent I
“fully and fairly” settled (a) the district court’s jurisdiction of the Fents’ claim against ONG, (b) the construction of Rule 6a and (c) that rule’s effect on the claim, reconsideration of those issues before the Commission would amount to an impermissible collateral attack.
On certiorari previously granted, the Court of Appeals’ opinion is vacated and the Corpo
ration Commission’s order is reversed.
All Justices concur.