does anyone try to link the PAs children to whole new master template?

Scenario:

1. Master template A1 link to 12 PAs & based CCM version 5.0.2 Agile template (more than 8 years)
2. New Master template A2 (unless than 1 year) was created & based on Jazz CCM version 6.0.6 ifix 6 (agile template).
3. Copied the above in the Dev environment.
4. Link the 12 PAs è Master template A2 (I received lot of error the first time I open the one of the child)
   
5. Master template A2: 29 new elements (attributes, state, action, ….). the 29 elements do exist in the Master template A1.