IDoc '&' has been set to status '30'.

What causes this issue?

The IDoc was set to status '30' as a result of the release for
reprocessing. Due to its output mode ( 'collect' instead of 'output
immediately' ) it is not outputted immediately.

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?

This IDoc is output the next time RSEOUT00 is run.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.