5.1 Establishing a relationship between primary keys
A relationship can be established by dragging the primary key from one data object to the other data object with which you want to establish a relationship.
5.2 Change/delete a primary key without a relationship present
If a primary key has no relationship, then the primary key is easy to change. Click on the dots again and click on change primary key. The primary key is then disconnected from this logical data dictionary. Now you can add the primary key to another logical data dictionary.
5.3 Change a primary key with a relationship present
The moment a relationship does exist, the action remains the same as above: click on the three dots next to the logical data dictionary and click on change primary key. After this action you will get a pop-up with a warning. This indicates that there are relationships present from the primary key to a data object(s). If you still delete the primary key, the relationships jumps to the top or bottom of the data object. The relationship therefore remains visible. It is not desirable to have a relationship that does not run between primary keys.