Order Import Erred when same orig_sys_document_ref been used in mutiple Orders

I'm using Order interface to update a booked order, the orig_sys_document_ref on the order has been used in 5 orders, the same error : "You are trying to insert an existing order or update an order that does not exist.  Please enter a correct operation code."  was showing in every interface lines. I also get error:"ORA-01422: exact fetch returns more than requested number of rows in Package OE_ORDER_IMPORT_SPECIFIC_PVT Procedure Pre_Process.header_change_sequence_validation"

I attached the log file in the order import and child order import program, please help to figure out how can I update an order with orig_sys_document_ref has been used in many orders under the same order source and operating unit. Thanks.