I have a PostGIS database having a Primary Key from two fields id_cat and id_cdad. When I load this database in QGIS in my computer under Linux there are no problem. I unmark "Select ID" and I can mark more than one field in the combo box of Primary Key because there are a checkbox that let me do that. (QGIS 2.12 under Linux Mint 17.0)

Now I want to install my database in a computer under window, but there aren't the checkboxes close to the name of fields, so I can't to mark more that one field for define the primary key. (QGIS 2.10 under windows 7)

Any suggestion?

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I have updated the QGIS version to 2.12 on computer under window and I can see and mark the checkboxes so I have solved my problem.

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