Hi Stephen,
Reviewing the attached document and requirements, it may be worthwhile to explore a simple concatenate of the data store node as a derived field ( as opposed to a join ). For example :
Looking at the LHS, the concatenate field is derived ( this is created manually, not pulled from the data ) :
Looking at the RHS :
Once this is in place, a recon node ( labeled "recon check" within photo ) will check both the LHS and RHS :
Matthew Kennedy