Leading zeros are coming in assignment field
We have posted customer advance document through F-29 and we are giving cheque number in assignment field which is of six digits. But after running transaction FF68 system creates one session and when we execute that session system creates one accounting document but changes the cheque number with 13 digits value(seven leading zeros with cheque number). If we follow the above process in (development server)system is only showing cheque number without any leading zeros but the settings of both the servers are same.
Request immediate help.
Thanks in advance.