Reported for version 10
How to disable editing of specified columns in RDM?
In RDM Logical Model of RDM IDE, open the table in which you want to disable the editing of columns. In Columns property, choose the wished column and check the Generated checkbox of this column. Once doing so, the chosen column is visible in the web application, although it does not contain any data. Adding a new value is possible only when creating new records. Otherwise, when editing the existing record, you will not be able to fill in this column.