Message no. VL150

Hi Experts,

I have an error: Only 0 EA of material 431915010791  available Message no. VL150.  I check in MMBE and found sales orders on that storloc, I check MD04 and still there are open reservations equal in MMBE (15pcs), but when I check VA05 and clicked open orders, there are only 1pc each of the 5 open sales order in that storloc.  There are still 10 missing.  Where should I check next? Please advise gurus.Thanks in advance.

Jake