UNIT Field in MASS ADDITIONS Window IS POPULATED FROM WHERE IN AP?

HI,

We just upgraded from 11i to 12.1.3 and in R11i, our Mass Additions window for the Unit value (# of Units of the asset) usually populated to a number of ' 1 '.   With the upgrade the Units now take on the number of units that is greater than 1.  What field in PO and therfore in AP populates this field.   The method of doing up the PO's has not changed.  Due to the business processes they set up PO's where the COST of the Order is equal to the QUANTITY and the Unit Price is set to $ 1.00.