Axapta, create an EDT for allow particular data display in drop down list

When the table contain the list of data that can divide in to few groups as below

but we only wish to select a particular group of data (example Zone) to display in drop down list in form.
Hence we create an EDT to help us for the filtering job.

Steps


1. Create a EDT, and set a normal relationship for it

2. Set the relationship as below :-

3. Create a related field fixed relationship :- 

4. Set the relationship as based on the enum value in Base Enum :-

5. Done. =)