This is my first attempt to add a table to a RDD. The jobtraveller report needs to have a field from the Part table (Part.Specification).
I added the table, added the relationships (to the best I could figure it out ) got a few errors because my fields were excluded… but got it to work without errors.
So I went under the Reports table and saw my Part table present, but it is empty.
Not answering your particular question but I find the Linked Tables features much easier than adding a new table. Start with selecting the JobHead table and go to the Lined Tables Tab. Make sure that PartNum is in the Picked panel.
Switch to the Description Fields tab and make sure PartNum is chosen for Pick Fields for this Link. Now just select the fields you want, like Specification.
In your SSRS report, you access the field as PickedFieldName_Field, e.g. PartNum_Specification.
Before adding a table, I will try using a Linked Table first since there are fewer steps to get the job done.