Cannot change Governance Scope of attributes

Hello Experts,

I need to change the governance scope of an attribute REPRF of Entity BP_COMPNY.

I am doing this by using customizing activity (in MDGIMG) : Master Data Governance -> General Settings -> Process Modelling -> Define Governance Scope.

When I change the 'Governed' column from Yes to No and then save then a message comes at the bottom the screen and does not saves.

Please find screenshots below:

Please share solution for this if anyone knows.

Thanks,

Swati Verma