Mahboob - as discussed, with the Core positions we will often need to split up trades into 2, or even 3, as we augment or decrease our positions. As you mentioned, the current system cannot handle multiple identical opens on the same day. 

You have proposed a solution where we could specify the Annotation ID of the Open Buy Position that a Sell Closes.

Two considerations:
1) we shouldn't have to go back & change all the previous Sells since 2012  on the system
2) we should be able to Handle 2 Sells on the same day, each, of course, referencing a unique Buy 
