OPSK field not editable in change mode

Hi All,

I am facing an issue in OPSK tcode, the following screen is coming up.

I have already shared the su53 screen to basis team, but as per them there is no technical authorisartion issue as such.

I checked that snote 375945 cud be an issue, but this note is redundant as i am working in s/4 hana .

Any help on this will be appreciated.

Regards,

Rohit