You cannot assign any requests to project &1

What causes this issue?

You want to create a request in project &V1&, or assign an existing
request to this project. However, you are not currently allowed to use
this function for this project.

System Response

The function terminates.

How to fix this error?

Contact the system administration.

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.