Hello,
There have been recent changes in this process and we have decided to document them in a KBA. Please take a look and let me know if some information is missing or unclear:
2311470 - Automatic carryforward is only allowed for amount 0 - FMCF101 or FMCF320 in MIRO
Link:
https://i7p.wdf.sap.corp/sap/support/notes/2311470
thanks and best regards
Mar