Sales Order Automatic Reservation and Unit of Measure Issue

 Inventory unit is EA, Sales unit is CASE (=36 EA), Avail Inventory is 44 EA.

If Sales Order quantity of 2 CASE is entered;

Manual reservation will show 1 CASE Available and Reserving  it will  reserve 36 of the 44 pcs

Automatic reservation will show 1 Case Reserved, but all 44 EA are reserved.

Is there any way that I can limit Automatic reservation to full Multiples of Sales unit (i.e. only reserve 36)?

 Changing the rounding method on the Unit Conversion factor does not work.

Thanks in advance for your assitance!