Currently, association fields are not listed under the Fields section and cannot be selected in the designer. Refer to the Q486178 ticket for more details.
ORM Data Model Wizard - Make it possible to apply custom attributes for association properties
Answers approved by DevExpress Support
We have implemented the functionality described in this ticket. It will be included in our next update(s).
Please check back and leave a comment to this response to let us know whether or not this solution addresses your concerns.
- v13.1.4Download Official Update