Data Modeler can't generate a FK?

I have a table with 3 FK constraints. Import if from the DB into data modeler and one FK constraint is gone.
Trying to generate it in the model (using it only for documentation anyway) and "New FK Relation" button doesn't do a thing but annoy me with a message: "Incomplete FK definition". However, it doesn't tell me what exactly is incomplete and I suppose clicking on one table and the other should provide enough information to process FK generation, especially since the first table has a PK and the second table has non-PK column with the same data type as first table's PK.
Is this a bug or is there some sense behind the erratic behavior?

First - are the PK column and the target FK column the same size? Having the same datatype is not enough for SDDM, they must be the same size as well. Once you draw the FK line between the source and target tables you should be seeing a FK properties dialog. In that there is a set of options on the left pane that includes a link for selecting the columns in the FK. Once you see that there is a drop down list for to select the target FK column. If your column is not in that list, there is something off in the column definition such that it does not match the source PK. In that case you will need to modify the target column definition before the tool will let you use it in the FK.

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