MYOB Crashes when crediting a sale of an item

Please help, my MYOB file keeps crashing when I try to record a credit with a negative balance.

I have been using MYOB for years and have never had any problems until recently.

This is what I am trying to do:

"If the item was priced incorrectly you could record an item sale where the quantity and incorrect price appear as the first line as a return, followed by a second line with the same quantity at the correct price

This would give you a negative dollar value total and a net zero quantity, which would create the credit without changing the on hand quantity of the item"

Thank you