Change Activity is disabled in Tcode GCV2

Hello,

One of my Functional consultant has reported,I’m trying to test a config change in DEC-220 (tcode GCV2, field “Activity Type”), but the field appears to be locked.PFA for more. I have checked SCC4 and SE06 SCC4:-Automatic recording of changes & Changes to repository and cross client SE06:-GLobally Modifiable. I have checked authorizations and it does not seem to be an authorization issue too.Is there any settings somewhere in SPRO etc?

Thanks, Rahaman