Binding Parameter Not Working - Page Composer

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Binding Parameter Not Working

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Binding Parameter Not Working when doing a personalization on Purchase Order page using Page Composer in Sandbox: 

 

I do not want a  PO Header DFF to display if there is a source agreement on the PO (I check for source agreement paramter not null). This works fine unless there are multiple agreements on the PO (We are using CPAs not BPAs). I have created an expression to render the DFF only if binding parameter source agreement is not null.

However, this  condition checking source agreement is not null does not work if there are multiple agreements and it displays the DFF