designer server generator: no foreign keys to shared objects

Could someone tell me why the server generator doesn't generate foreign key constraints to tables which are shared from another application. In our case, he did generate the indexes on the foreign key columns. Any way to make him do it?

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Kind reGards,
Hwyl fawr,
Gerard
(G.Pille_at_company-benelux.be; ghp_at_skynet.be)