VA01 Item category display only for specific order type
I have a requirement to deactivate(display only) item category field in VA01 table item for certain order type . I tried the user exit MV45AFZZ(USEREXIT_FIELD_MODIFICATION). This is working only if the table item has a value. i.e I could able to enter an item category first and then enter the material and quantity.
So please suggest any alternative how to make the item category field(VBAP-PSTYV) column display only for centrain order type.