Solution : https://service.sap.com/sap/support/notes/400098 (SAP Service marketplace login required)
Key words :
se51 program saplmr1m screen 6410 layout editor select function change, se51 program saplmr1m screen 0210 layout editor select function change, menu 'goto' --> 'secondary window' --> choose function 'dict, component component typepernr pernr_dthen activate structure cobl_mrm, multi-account assignment screen, additional key words pernr, prerequisites field drseg-pernr, include field drseg_co-pernr, choose function 'continue', select field pernr
Related Notes :
| 453646 | BAPIs: No direct posting to G/L account/material |