Inventory Managment Combining Lots

Combining Lots is checked for Panadol

1/-Have created a drug Panadol at the demo site http://demo.openemr.io/a/openemr
2/- purchased two lots 8xm and 9xm with 10qty each Total inventor=20

Problem:
In prescription qty=12 Panadol to patient “Phil Belford”
click get the message
“Inventory is not available for this order.” Also inventory is not deducted.

Info: when prescribe 10 or less qty works OK

well any one using Inventory with multiple lots combined?

none here to help on this issue related to combined and multiple lot