Hi
I am trying to add an attachment sub-grid to the Letter Activity Entity form.
I would like attachments for 'only related records' to show. However, the Attachments Entity is not available as a data source when the 'only related records' option is selected.
I think it may be because there isn't a relationship between the Letter Activity and the Attachments entity.
However, when I attempt to create a relationship between the two entities, the Attachments Entity is not showing up in the 'Related Entity' drop down to create the relationship.
How can I create a relationship between the Letter Entity and the Attachments entity?
There are existing relationship between the Appointments entity and Attachments entity, and also the Email entity and the Attachments entity - the behaviour type is 'system'.
Many thanks
