Immediate processing in job '&'

What causes this issue?

At the time of IDoc generation, there were no resources for immediate
processing and your system is configured so that if this happens, IDoc
processing should be started in a job. Therefore, the job '&v1&' was
started.

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?

If the IDoc still has status 64, look for the cause of the error in the
log for that job.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.