For Interface Transactions,INV_TXN_MANAGER_PUB.PROCESS_TRANSACTIONS DOES below things:

1)validate_group (Validate a group of MTI records in a batch together)

2)validate_lines(Validate each record of a batch in MTI)

3)tempinsert(insert records from MTI into MMTT)

4)calling inventory transaction Manager(insert records from MMTT into MMT)



For Pending Transactions,INV_TXN_MANAGER_PUB.PROCESS_TRANSACTIONS DOES below things:

calling inventory transaction Manager(insert records from MMTT into MMT)