Hello,
As said above, the item category here is defaulted with standard configuration
based on material type and the maintenance plant.
Important note:The above is applicable to the components that are placed in the order not from BOM.
If in case you want a different category other than above setting, you can assign components to the
order using a BOM, where the item categories will be copied from the BOM items onto your components in the order.
If this is not suitable, then you have to go with ABAP development(Enhancement CNEX0013; exit ZXCN2U07)