Hi Stefan Lorenz,
I tried to reproduce the problem but with no success. Having a constraint or not should not reflect the way associations are created. Please note that the name of the parent property may not be the one that you expect, in such case you can rename it manually.
If the property is really missing, we would like to know a bit more information about your setup. Does this happen with every table or only with the first one you tried? If this is observed only with particular table, please send us its definition so we can try to reproduce the described behavior.
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