Indirect Cost % in Purchase Line

idiot

From the help file:

The program automatically retrieves the indirect cost percentage from the Item table when you fill in the No. field. The field is blank if the item card does not contain an indirect cost percentage.

However we have a problem of some number populating this field when indirect cost is not being used. The Item Card Indirect Cost is verified to be zero. The field is hidden so the possibility of user entering is out.
What other fields or tables or functions would affect this Indirect Cost % field?

Thanks.

Karenh

The field Unit Cost (LCY) has, in its OnValidation trigger, code that populates this field if the Direct Unit Cost is not zero, and the Direct Unit Cost is not equal to the Line Discount Amount divided by the Quantity.