Customer order is negative in SIM

Hi All,

We are having scenario in that customer order goes to negative.

we placed a new order , all items were in stock, We verified and retrieved the order, but once the payment had been taken

We checked SIM and found on hand had increased to 3, from 1, and customer order was -3 and unavailable -3.

1. Stock Before Sale -

          Total Stock on hand - 1

          Available SOH -1

          Unavailable - 0

          Customer Order - 0

          In transit quantity - 20

2. Stock After Sale -

          Total Stock on hand - 0

          Available SOH - 3

          Unavailable - -3(It is negative)

          Customer Order - -3(It is negative)

          In transit quantity - 20