After prompting the user for the missing information, Continue = False.
I think that should do it.
**ADDITION TO ABOVE**
If the action causing the Save and Close is a Formula Language action you can use:
@If(@Command([FileSave]); @Command([FileClose]); @Return(“”))
This means the document will only close if the save is successful, otherwise it will NOT close – the save failed.
Mike Kinder (SlikTool)