Hi RK,
If you change the value field description, it will flow to operating system also, if now, please regenerate in the non business hours.
Once you create a new value field, goto KEA0 Click on display<--> change icon in data structure tab, you will get the pop up "
Caution! You are changing/deleting cross-client
settings" click on ok, then click on change tab in value field tab, you can see unassigned value fields in "copy from" side, select that and move it to left hand side, then the color of the value field become blue. Now save and in environment tab activate the operating concern.
Regards,
Ravi