mtl_transactions_interface

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*** Sample code to add item quantity is available here. It inserts records into mtl_transaction_interface table that add item quantity
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Transaction_mode,lock_flag and Process_flaf	Records with these columns values of 3,2 and 1 respectively are picked by transaction manager for processing. If process_flag is 3, then that record could not be processed due to some error. ERROR_CODE and ERROR_EXPLANATION will be populated with the cause for the error. .
transaction_type_id	This is foreign key to MTL_TRANSACTION_TYPES. TRANSACTION_TYPE_ID
Source_code	any text for your own reference