Copy Business Partner from OTR to FU

Hi Experts,

I hope you can help me with the following question. I have the Business partner 'Goods Buyer' available in the OTR which represents the Sold-to in the respective Sales Order on ERP side.

I'd like the system to copy the partner Goods Buyer from the OTR to the Freight Unit automatically since I need the partner to be considered in incompatibilties on FU-FU level.

Can you please let me know what is the easiest way to accomplish this requirement?

Thanks for your help

Thomas