Hi,
If you dont want to use BADI/User exits/Enhancements, then you have the below option:
1. Activate PRT availability check in OPJK transaction for the order type/plant.
2. Maintain documents via DMS and assign to a document PRT
3. Lock the status of the PRT document
This would have impact in production order PRT availability check.
Otherwise, you have to use exits/BADI only to customise your requirement.