Create Corrective Credit Memo - Field Value Problem

ACBuCe

Hi,
I get the following error when I try to create a credit memo from a Posted Sales Invoice where Closed Field is True.
"Invoice SQO-002200 is closed. The corrective credit memo will not be applied to the invoice. Show applied entries |Skip|Create credit memo anyway"

How can I skip this Error? Because it I can't change a custom Boolean field that is True is Sales Invoice Header and I want to make it False in sales Hedear for current created Sales Credit Memo. It works when Posted Sales Invoice has the field Closed No, but not when the closed is Yess.

I will appreciate your help guys!