Hi! I'm using Pega 8.7.5

I have the class REPO-Reporting-Work-Reporting, where I'm creating a report definition called CasesAndCondominium. Plus, I'm trying to do a class Join between this class and REPO-Reporting-Data-Condominium class. The REPO-Reporting-Data-Condominium class has pyGUID as primary key.

I'm doing the join this way: 

Where .CondominioSelecionado is a case property that stores the pyGUID value

of the Condominium class when the user selects a Condominium in a dropdown.

My report has 5 columns: pyID, pyStatusWork, CONDO.Name, CONDO.NumberOfBuildings and CONDO.Description.

I don't know why, but when I run the report, no results are shown. Is there some problem joining with pyGUID of another class?

For testing purposes, I created another column in the Data-Condominium class, storing the same values of pyGUID, you can see below:

And after doing CondominioSelecionado = CONDO.CondID join, it worked...

Can anyone explain me the reason of this behavior? Why joining with pyGUID is not working?

Thanks in advance!