IDoc cannot be sent in XML format

What causes this issue?

Possible causes of error:
<ZH>XML_NAMES_ERROR</> Error when creating document name.
<ZH>SOAP_MSGID_CREATE_FAILED</> System error when creating UUID.
<ZH>SOAP_MSGID_PREFIX_INVALID</> The IDoc is to be sent using SOAP and
the namespace <ZH> 'urn:sap-com:document:sap:idoc:soap:messages' </>. In
this case, the field <LS>ARCKEY</> is given a unique message ID that
contains the prefix <ZH>'urn:sap.com:msgid=' </>. The IDoc in question
already has an ID in this field of the control record, and this ID does
not contain the required prefix.
<ZH>SOAP_MSGID_INITIAL</> The field <LS>ARCKEY</> of the control record
has the value 'urn:sap.com:msgid='. In this case, the required prefix is
there, but the actual message ID is missing.

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

System Response

The IDoc is saved with an error status.

How to fix this error?

Inform your system administrator.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.