Blank subcontract PO after poping error message

Has anyone faced this problem of generation of blank sun-contracting purchase order if there is some error message poping up after choosing “carry out action message” in subcontracting worksheet?

Lets say if the the item in the subcon worksheet line is not having UOM & if I click on “carry out action message” it gives error for missing UOM & instead of stopping there it creates a subcon PO with the listed vendor but no item.

sound similar?