The  Mfr. Part # and Mfr. # must be  a valid combination.

If the Mfr. # field is blank and the Mfr. Part # entered is same for more than one internal Part #, the system considers the Supplier # entered as Mfr. # to retrieve the internal Part #. The user must enter the Mfr. #, if Supplier # is not available or for the combination of Mfr. Part # and Supplier # internal Part # cannot be retrieved.

If a value exists in the Part #, Mfr. Part # and Mfr. # fields, the system ensures that the combination of Mfr. Part # and Mfr. # corresponds to the Part #.

If a value exists in the Part # and Mfr. Part # fields and the Mfr. # is blank, the system ensures that the Mfr. Part # corresponds to the Part # entered.

If a value exists in the Part # and Mfr. # fields and the Mfr. Part # is blank, the user must enter the Mfr. Part #.