Relationship Help Please

I am having problems with a relationship I have my main database then I have separate database for my images.

I have added my data source from my picture database I trying to link T05_CONTACTS = T05x_contacts_PHOTOS||id_contact|
but in my T05x_contacts_PHOTOS||id_contact| table my the table I'm trying to join is blanked out can anyone please put why.

relationship.png

Thank You
(aka extreme)