What might be the cause of a condition not working on a request property?

What version are you using?

Did you add a custom FK column to the table LDAPAccount in the tables ShoppingCartItem and PersonWantsOrg?

What exactly do you mean with, does not seem to work?

Thank you for your response, issue has been found in the meantime.

Problem was that I had removed 'dbWhereClause()' from the Where Clause on the (custom) component. 
Because I was using that filter for an edit where no req.properties are involved and thought dbWhereClause() was redundant because nothing was filtered.
But that messed it up for the things where the same component was used and where there ARE req.properties involved.

Lesson learned