If you have set up generalized codes for the Purchase/Manufacture field, you must add W (flow) and (L) line manufactured as valid codes for field pt_pm_code using Generalized Codes Maintenance (36.2.13). You can modify Purchase/Manufacture codes for existing items one at a time using item maintenance functions (1.4.1, 1.4.7, and 1.4.17), or use a batch load file to update some or all of them automatically.