Check and Change MSEG-GRUND and CHARG in MB1C (cust.function / BAdi)

During transaction MB1C I've got to check

some data and afterwards to call a customer dynpro or popup( where the user can choise one Reason for Movement or Exit).Finally I've got to change MSEG-GRUND or MSEG-CHARG. I tried these Exit but they don't work as I want.

MBCF0002/MBCF0006/MBCF0009/MBCFC003/MBCFC004/MBCFC010.

These Badi can't change any values.

MB_DOCUMENT_BADI

MB_DOCUMENT_UPDATE

It's possible to use BAdi/Exit in my case or I've got to use Enhancement or modification ?

Thanks in advance.