Creating Units of Measure To create a new unit of measure on the Unit of Measure Codes form, perform the following steps: Verify that the unit of measure you want to create is not already in the system by scrolling through the list. Click in the first empty row at the bottom of the list. Enter the code for the new unit of measure (three-character maximum). Note: Where possible, select an ISO unit of measure from the drop-down list, rather than creating a custom U/M. Enter the description of the unit of measure. (The description defaults from the ISO Unit of Measure Codes form if you selected an ISO U/M.) If your planning mode is APS, specify the Planning Precision factor, if needed. This field is used for APS. Close the form and save your changes. Related topicsAbout Unit of MeasureCreating Unit of Measure Conversion RecordsMapping ISO U/Ms to Existing U/Ms