Solution : https://service.sap.com/sap/support/notes/781017 (SAP Service marketplace login required)
Key words :
/sapapo/posmapn-posid = /sapapo/obref-posfr, check option 'delete inconsistent records, report /sapapo/sdorder_del sucessfully removes, check option 'delete obsolete records, mapping table /sapapo/posmapn anymore, field /sapapo/obref-posfr, field /sapapo/obref-posto, terms sd order tables, table /sapapo/obref pointing, /sapapo/obref-posfr
Related Notes :
553476 | Composite SAP note: Report /sapapo/sdorder_del |