Any way to change Sold to party after Purchase Order being created in ME21N

Hello All:

I have a situation here. I have created a Sales Order via VA01 t-code. The material used is a third party drop ship. So when I create a Line Item in my Sales document, it creates a PO requisition. Now via ME21N, I have created a Production Order.

Now the user wants to change the Sold to party at the Sales Header. But since the PO is attached, it won't let me change the Sold To party and the reason is because Subsequent document has been created. Is there any way, I can decouple the Purchase Order / Purchase requsition and then make the subsequent document go away. And then I can change the Sold To party ?

Please advise.

Thanks,

Dipankar Biswas