Item availablity

Hi All,

I'm doing a tranfer order. I'm transferring 9 item from 1 location. I can see that there are 9 remaining qty  for that location but when I tried to key-in the qty on transfer order line, the system said that I have insufficient qty.

When I check the item availability I have 3 items available.

I check the Ourstanding sales line with that item but found nothing.

I check the item ledger entries and filter by that location and found 9 remaining qty.

Can i check with you how the system trace the this available qty?

Thanks,