How can we Hide a DFF on a BPA/CPA only for particular PO types?

Summary: We have a requirement in which the client has requested to hide a DFF on BPA and CPA for a couple of PO Types only (BLANKET and CONTRACT). We need suggestion regarding how to make the DFF hidden or a confirmation on if its doable or not. If not, then why?

Content (please ensure you mask any confidential information): We have already tried few things using sandbox. The rendering the attribute to "False" hides it for all the cases. We tried to put PO type specific condition (Shared in code snippet) to hide the DFF for the two PO types only, even that did not work. Again, either the DFF was getting hidden for ALL PO Types or was visible for all.