Changes to ZXCO1U06 are forbidden by ABAP01
kindly tell how to remove this error.
The user 'ABAP01' should have 'set EDITOR LOCK' to the include ZXCO1U06. He has to remove editor lock in order to make changes by other users.
EDITOR LOCK can be set/unset from the ATTRIBUTES of the program.
The editor lock flag prevents other users from making changes to the program. This includes attributes, documentation and text elements, as well as the functions "Rename" and "Delete".
Only the last person to change the program can remove the flag.