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You must just take care that only one user is activated as vendor. To achieve this and to be certain to get a mapping to the vendorId = 1, enable the multivendor mode. Go in your users list, enable your desired shopowner as vendor. Before you edit this user now, you must set the "enable multivendor" to "none" again. Then logout,.. login as the desired shopowner, go in the shop config and you should have your vendor tab. Enter your data and store it. The tables should be fixed now. When the problem persists, you must manually fix the tables with phpmyadmin.