CS02-Change BOM Screen exit/enhancement for Change Management

Dear Experts,

How to  make the Change Number field in CS02  initial screen mandatory for selective plant/plants only. e.g. In CS02, If we enter XYZ plant in the Plant field, automatically Change Number field will get mandatory.

Without Change Number, user won't be able to make any changes in the BOM for selective plant/plants.

Please suggest the solution for the same. Thanks in advance.


Kind Regards;