See - G.R. No. 176123
"x x x.
More than a year after it failed to obtain a reversal of the judgment based on compromise agreement in the Pagadian case, and long after the conclusion of the execution sale pursuant thereto, FPC sought to alter the adverse results of the Pagadian RTC final and executory Decision by filing a complaint for annulment of the Pagadianexecution sale with damages with the Manila RTC a court of concurrent and coordinate jurisdiction.
FPC had also previously caused a defunct sister company, TEI, and its so-called stockholders to lodge another complaint for annulment of the same Pagadian case execution sale with damages with the Antipolo RTC another court of concurrent and coordinate jurisdiction as the Pagadian RTC.
This Court would be the last to sanction such a brazen abuse of remedies and disrespect of judicial stability.What is clear is that FPC is feebly attempting to disturb the effects of a judgment that, by its failure to appeal, had long become final and been the subject of execution. This cannot be allowed without running afoul of the settled doctrine of finality of judgment.
Once a judgment attains finality, it becomes immutable and unalterable. A final and executory judgment may no longer be modified in any respect, even if the modification is meant to correct what is perceived to be an erroneous conclusion of fact or law, and regardless of whether the modification is attempted to be made by the court rendering it or by the highest court of the land.
Litigation must end and terminate sometime and somewhere, and it is essential to an effective administration of justice that once a judgment has become final, the issue or cause involved therein should be laid to rest. Utmost respect and adherence to this principle must always be maintained by those who wield the power of adjudication. Any act which violates it must be struck down.
x x x."