When to question execution of judgment

Parties may not object to the execution by raising new issues of fact or law, except under the following circumstances:
the writ of execution varies the judgment;
there has been a change in the situation of the parties making execution inequitable or unjust;
execution is sought to be enforced against property exempt from execution;
it appears that the controversy has been submitted to the judgment of the court;
the terms of the judgment are not clear enough and there remains room for interpretation thereof; or
it appears that the writ of execution has been improvidently issued, or that it is defective in substance, or issued against the wrong party, or that the judgment debt has been paid or otherwise satisfied, or the writ was issued without authority.[1]

[1] Philippine Economic Zone Authority v. Borreta, 519 Phil. 637, 642-643 (2006).