Credit Control Area - Sales value is Nagative

Dear Freinds,

In FD33 - Customer Credit Management Display - Status

Sales values show Negative Figure..All this Negative values comming Open Deliveries.

Why do we have negative figures in Open Deliveries ? How can I find those open delevery documents to reconcile this negative figure?

Approciate if any one clarify this.

Thanks,

Venkat