Workflow &: Repair message for error && could not be created

What causes this issue?

The error &V2& &V3& occurred when the workflow &V1& was executed.
To correct the error, the system tried to send a message to the
workflow system administrator. This message could not be created
because the function module 'SO_OBJECT_SEND' raised the exception &V4&.
The exact cause of the error can be found in the workflow log for the
previous or subsequent error message.

System Response

The workflow was suspended and set to <ZH>error</> status, without the
responsible administrator being informed.

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.

INCLUDE NA_WF-ADMINISTRATOR OBJECT DOKU ID TX
Correct the error and continue the workflow (change work item and set
to status <ZH>In process</> manually).

Error message extract from SAP system. Copyright SAP SE.