service entry sheet accepted but not getting transferred to TM

Dear Experts.

I created a freight settlement document which has cost distribution enabled in TM

I transferred the settlement document to ERP.

In ERP : PO and service entry sheet is created and accepted succesfully.

But in XI i am getting an error like "No unit of measure passed on" because of which the po and SES is not getting transferred to TM.

Can anyone tell me why is this happening or what could be missing?

Thanks in Advance.