in one of my document class having 2 fields. Channel and Branch. Based on the channel(Drop down field) value we need to get the Branch(Text field) values. All Channel and Branch values are there in Database. Now i am able to get channel and branch values. Currently we able to change the Branch value and enter wrong value. but we need to restrict the changing of the branch value. to achieve this i make this branch value as Read only. while save the document Branch value is not updated to the document.
Could you please suggest me how to achieve this?