Add CentralAccount from PersonOrdered to PersonWantsOrg table

Hello, I performed a Schema extension on the PersonWantsOrg table with the intention of introducing PersonOrdered's CentralAccount, I'm trying to get the value but I can't, I tried the following code:

If Not String.IsNullOrEmpty($UID_PersonOrdered$) Then
Value = $FK(UID_PersonOrdered).CentralAccount$
End If

However, I was not successful, even though I managed to compile the database normally, the intention is that in the request history there will be a column showing the CentralAccount of the user who received access.

All help will be welcome, thank you.