Solution : https://service.sap.com/sap/support/notes/390892 (SAP Service marketplace login required)
Key words : 
additional key words cif, field ignore_pegging, user exits, output nodes, input nodes, planned receipt, corrections ensure, pegging-relevant, manufacturing order, production order
Related Notes : 
       
| 402979 | APO->R/3: Fixing, pegging relevance not sent | 
| 395333 | R/3->APO: Do not transfer Ignore Pegging | 
| 387179 | Structural enhancement output node to manufacturing orders | 
| 359961 | R/3->APO: Phantom assemblies rel. to reqmt in order |