Error while processing message payload Element 'CategoryCode'

Hi Experts,

I am trying to integrate SAP ECC with TM. I have transferred the sales order from ECC to TM, but its not triggering order based transportation requirement (OTR) instead giving an error Error while processing message payload Element 'CategoryCode&#39 and all the xml messages are stuck in inbound queue. The screen shot of the issue is as appended herewith. Please advise.

Thanks & Regards,

Aunkur De