Message SAP WVMI301 - EDI partner &1 and vendor descr. &2: no distribution chain found

Diagnosis
When an IDocs is received from a customer, the system uses the customernumber and vendor number transferred by the customer via EDI todetermine the sales organization data.
No sales organization data could be found for the current combinationof customer and vendor number.

Procedure
In Customizing, assign this combination ofcustomer and vendor number to a validsales organization.