Change no: is not loading from the backend

Hi Experts,

 

I have created a new form in SM 9.40 and mapped a table with values like change number, title, affected press etc. When I do search in the new form every fields except the change number field is getting filled from the backend.

 

Could anyone please tell me why only the change number is not loading from the backend.

 

Thanks & Regards,

Sandhu Mol