& & is new and is being processed by &

What causes this issue?

The object is being created by the specified user.

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 can only edit the object once the other user has finished editing
it. If you want to create a new object, you must choose another name.

Error message extract from SAP system. Copyright SAP SE.