I did migrate/upgrade Alfresco step by step from 5.1 to 5.2 to 6.0 and to 6.1. This all seems to work okay. And the custom models also works okay. The first day the custom model layout was working fine, but after a day not. All properties for that model is not visible in the UI anymore.
Going to model manager and opening the model, I can see there is no layout although there should be one. Opening the layout editor and re-create the layout does not work. Following error is shown in the server log.
2019-08-20 11:07:44,050 ERROR [surf.types.ExtensionImpl] [http-nio-8080-exec-69] An attempt was made to add a new ExtensionModule with the id "CMM_LogiControl" but an ExtensionModule with that id already exists.
I tried one more time the upgrade procedure and same thing. Worked one day and next day the layout was missing again.
Please help. Any ideas how I can restore the layout or remove the old one so I can re-create a new layout?
Side note: The server is using tenants.