Split Back to Back order lines

Hi,

I am doing a test for back to back orders in Vision instance R12. I created a Back to Back order and the requisition was created. I am trying to split the lines now as the customer wants a part of the goods now and some parts at a later date.

I had read that there is a processing constraint where in the split would work. Also in Metalink I read that there is a patch 10338643:R12.ONT.B where in the splitting of lines can happen. This patch was applied. But now when I am trying to split I am getting an error message