Spool request &1 is still being described; action is not possible.

What causes this issue?

You are attempting to output a spool request that is currently still
being written.

System Response

The system does not allow this action because the request has not yet
been completed.

How to fix this error?

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

Procedure for System Administrators

Report RSPO1043 deletes write locks on requests that were last changed
at least 7 days ago.

Error message extract from SAP system. Copyright SAP SE.