After some experiments, I believe the issue lies within the RDD.
So let me pivot…
I have a plain JobTrav RDD here that I copied from the original. I was able to create the PlantWhse data source, but when I go to add the relationship, it says the key ID is invalid.
Original that is successfully used in a Crystal Report:
Yup… I think the “Potential Gotcha” I mentioned earlier gotcha after all.
Since you’re working with a new copy, you should be able to uncheck the excluded checkbox on JobHead for the PartNum column. That may allow you to add it as a key.
You’ll need to do this anyway so you can use it in a relationship.