Delete button on MLC schema is greyed out

Hi Solman Experts,

I am trying to config ChaRM in Solman 7.1 SP11. I am using the solman_setup wizard and try to copy the SAP delivered schema SAP_SOLUTION_MANAGER_TEMPLATE in the Z namespace. But when I do that the 'delete' button is greyed out. I need to delete the extra lines because I am not using Incident Management and need to assign these categories to transactions in Z namespace.

Would appreciate your help if you can let me know how to activate or go around this delete button.

Here are some of the troubleshooting steps I have tried.

1. Saved, logged out and logged back in.

2. Created a new version.

3. Tried different browsers - IE, Fixefox.

None have helped so far.

Appreciate your time.

-Anshul