I may have had once the same problem in my early days with Doctrine, and, provided that I remember correctly, it was related to the definition of the local identifier used for the relation. In your case "uid": try whether declaring it as a integer(4) help to solve the problem. Strangely enough (or maybe not, I may not know the big picture), the sfGuardUser id is declared as an integer(4). Seems not to be the same as an integer. This is what makes SQL refuse to establish a link between two fields of different size, even though they are both integers but of different sizes. Hope it helps, cheers RAPHAEL
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