GST- How to process material rejections by QA person at the time of Material Receipt in GST

Dear Concern,

AT the time of quality check QA person will check and reject defect material while accepting the Material during MRN process.

while Making AP invoice we can create supplier invoice to the extent of accepted qty only. But unless we receive Credit note from supplier we can not notify the rejection in GST. there will be delay in supplier credit note process. how to record the credit note in our books. becoz we created supplier invoice to the extent of accepted not full qty.

pl share the process to be followed.

Thanks

Thriveni