Object & with nodetyp & is not allowed in model &

What causes this issue?

You used a wrong nodetyp in your model. Only a few nodetyps are allowed
in each model. The follow list shows the allowed nodes in the models:
EPCs -process: events, functions, and, or, xor and processpath
-scenrios: events, functions, and, or, xor and scenariopath

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

You have to change the nodetyp in your model.

Error message extract from SAP system. Copyright SAP SE.