What is an invalid procedure call?
Expr1: IIf(Left([tblQuestions.PageCode],7)="General","_",Left([tblQuestions.PageCode],InStr(1,[tblQuestions.PageCode]," ")-1)) & Format(Mid([tblQuestions.PageCode],InStr(1,[tblQuestions.PageCode]," ")+1),"0000")
I added the tblQuestions. to your formula, it...