Records Add Relationship (One to one)

I have a one-to-one relationship between the Loan and UCC Information entities, and I'm trying to add the same relationship from the Loan record, but it doesn't recognize the FK (Only displays entity's PK) from the 'UCC Information' entity for some reason.

Any kind of pointer will be  valuable!

                                                          Loan Record Relationship Snippet  

                                                                                    ER Snippet 

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