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

So I have a condition that says "UID_Person = '%UID_PersonOrdered%'", on a column that chooses an LDAPAccount.
What could be the reason that this filter does not seem to work?

it's assigned to the right service item

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  • 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