Diagnosis
The IDoc does not contain a valid header segment. Therefore it is notpossible to process the IDoc.

Procedure
SAP source system, file interface, BAPI
If your source system is an SAP system or if you have tried to load datausing the file interface, search for relevant SAP Notes and create a newproblem message if necessary.
Link to source system using a third-party tool
If you are using a third-party tool for transferring data, contact themanufacturer.