PartNum not available in RDD

I am trying to modify the JobTrav RDD to include the PartBin table, and when I try to create the relationship between JobHead and PartBin, the PartNum field is not available in either dropdown. This is very strange, because this field is present in both tables. I have never had this issue before. We recently upgraded to 10.600…has anyone else had this issue?

I tried creating a new RDD with JobHead and PartBin, and PartNum field is available…so I’m not sure why this JobTrav RDD is differrent.

I ended up joining JobPart and PartBin and now the field is available.