Hi Tazi,
Please check screen order or data first then re-create the session or process it in expert mode.
Program: SAPMF02D
0105 - Create customer
0106 - Change customer
Screen 0201
KNB1-AKONT KNB1-ZUAWA KNB1-BEGRU KNB1-FDGRV KNB1-ALTKN
KNB1-VZSKZ KNB1-ZINDT KNB1-ZINRT
Please check all above input fields for the screen 0201.
Please check this link as well:
http://scn.sap.com/thread/1427722
Regards,
Meghna