Maximum &1 lines sent from spool request &2

What causes this issue?

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

System Response

The system sent the displayed number of lines of a spool request.

How to fix this error?

If the documents that were sent are not complete, proceed as described
in Notes 329537 and 1540471.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.