How to Create a Primary Key for a Dynamics AX Table

This topic might not be new to most of you guys, but I always wondered how can I create a primary key to a Dynamics AX table?

You could easily create index in any table in Dynamics AX and you could specify that this index is “not duplicated”, which means that values of the field(s) should be unique among the table values. But this does not mean that you this index is a Primary Key index!

To create a Primary key you have to set the PrimaryIndex property in the list of that table properties.

When you choose the PrimaryIndex property you have to set that index as “not duplicated”. Once you do that, you will have the icon of that index changed to be like this: