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title: "Change the Purchasing UOM"
canonical: "https://kb.myframeworks.com.au/space/PROSTIXV48DOC/31102307/Change%20the%20Purchasing%20UOM"
format: markdown
---
This process explains how to change the Purchasing Unit of Measure for a selected Product throughout your database. First the system checks to see if average costing is being used. If it is being used and outstanding purchase orders exist then you are not allowed to change the purchasing UOM. If average costing is being used and there are no outstanding purchase orders then the purchasing UOM can be updated. If standard costing is being used then the purchasing UOM can be updated. After you have selected to update the purchasing UOM it is applied to all open purchase orders, credit notes, sales orders, debtor credits, quotes and CPF Requisitions within the system (holding the line sell on the sales orders and quotes where stock has been sold in the purchasing UOM to prevent rounding / repricing anomalies). Debtor sales type transactions (sales orders, quotes and debtor credits) are updated where a product has been sold / quoted in the purchasing UOM and the purchasing UOM is not equal to that product's stocking / selling UOM. Updates result in an audit record written to the inventory maintenance log for the change of UOM. To change the Purchasing Unit of Measure for a  selected Product throughout your database, perform the following: 1. From the  ProStix   Main Menu  select  'Inventory Management'  then  'Product Maintenance'  then  'Select Product' ,  then after selecting the product, choose  'More Data'  then  'Change Purchasing UOM' . 2. You are then presented with a screen that shows the current purchasing UOM with a field to type the new purchasing UOM. After typing in the new purchasing UOM, you are prompted to enter the conversion factor for the new UOM. Refer to the 'Change Purchasing UOM' collapsible link below for a screenshot and an explanation of these options: