Solution : https://service.sap.com/sap/support/notes/646476 (SAP Service marketplace login required)
Key words :
user exit source code suggested, customer-specific development class, message number /sapapo/om_error253, sample source code avoids, time ticket completion confirmation, sample source code, proposed source code, error message indicating, separate start date, perform intensive tests
Related Notes :
648447 | Confirmations change APO relevance of orders |
507755 | Confirmed operations are missing or COM error 253 is output |
367658 | Filtering out operations from orders in CIF |