Display Only Field in Customer Master

A couple of fields in the sales view of the customer master are non editable in my system. I needed to make this editable and performed the following activities:

1) I have gone to SPRO and made the changes against the account group and changed the field status group to "Opt. Entry".

2) I have also changed the transaction dependent layouts and have done the same here also. (For Customer Create and Change)

Is there any other activities that one needs to do as the fields still remain non editable and grayed out.

Thanks in Advance