EDI: Key part of record is incomplete

What causes this issue?

When an <DS:GlOS.IDoc>IDoc</> was created, an error was identified in a
data record.

How to fix this error?

Please check the following fields in the data record of the IDoc:
Possible errors:
- MANDT client is invalid
- DOCNUM number of IDoc is invalid
- SEGNAM name of SAP segment has initial value

Error message extract from SAP system. Copyright SAP SE.