No MM purchasing organization specified for TM purchasing organization &1

What causes this issue?

You attempted to save and transfer a freight settlement document from
SAP Transportation Management system to S/4 Hana system. However, the
system cannot post the document because some key information is missing.
You specified a purchasing organization in Transportation Management
(TM) in the document, but you have not specified a purchasing
organization for the purchase order and service entry sheet. The system
needs this information to map to the correct information in MM. The
system cannot create a purchase order and SES.

System Response

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

How to fix this error?

Contact your system administrator.

Procedure for System Administrators

You must enter the MM purchasing organization for the relevant TM
purchasing organization in transaction <LS>PPOME</> -> <LS>Org. Data</>
-> <LS>BSD Org. Unit</>.
When SAP TM sends the XML message for the freight settlement document,
the MM purchasing organization if maintained for the TM purchase
organization in the field BSD Org Unit is sent. On receiving such XML
on S/4 Hana system, the system uses this MM purchase organization in the
XML message to create PO and SES.

Error message extract from SAP system. Copyright SAP SE.