# Bill of Material BOM Qty Reset (BOM.P4)
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The BOM.P4 procedure is used to reset the BOM stock quantity in the bill of material records based upon the BOM UM Factor currently present in the parts master file. It will recalculate the quantity based upon the stock quantity entered in the BOM record and the BOM UM Factor found in PARTS.E .
This procedure would be used after changes have been made to the BOM UM Factor in PART.E.
Frequency of Use
The BOM UM Factor must be defined in PARTS.E for all necessary components and subassemblies.