Solution : https://service.sap.com/sap/support/notes/723474 (SAP Service marketplace login required)
Key words : 
requistions updates final issue flag, updates component table j_3abdsi, symptom afs external operations, update afs table j_3abdsi, service subcontract purchase order, production create purchase requistions, external operations differ, standard table resb, correction report z_afs_j_3abdsi_ext_oper, terms resb-kzear
Related Notes : 
       
| 729172 | ME52N: PR closed flag does not deactivate dependent reqmnts. | 
| 194221 | LB:EBAN-BSMNG incorrect after part.conver in PO |