Data Modules - Newbie questions

[jburchill]

Hello, new to data modules and not sure how they work or what they are used for.  I have been watching youtube videos and they make it look so easy.

I am trying to create a simple data module just to see how they work and start playing around.  I am trying to create a join/relationship between two packages.  1.  Accounts Payable and 2. Accounts receivable.  I click create new relationship, but I can only select one table in the join.  What am I doing wrong?

If I try to create a join from 1 package, just different tables within.  I don't even have the option to create a relationship?