Change requests must be assigned to a project

What causes this issue?

This request is not yet assigned to a project. The system is set so
that change requests must be assigned to a project (at least in this
client).

System Response

The request cannot be saved.

How to fix this error?

Assign the request to the appropriate project.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.