How to Disable VA02 Partner Screen Input (Header Data)

Hi Experts,

Is it possible to gray-off Partner input field of Partners Tab in Header Data (as shown in the attached file) of VA02 only?

My SD colleague told me that it is possible to disable that field in config but it will be disabled in VA01 as well. She's asking if it's possible that the users can input the partner during creation (VA01) but they will not be allowed to change it using VA02 anymore.

Thanks in advance.

/f