Hi Experts,
Please I need your help, my customer has an interface that executes a Call Transaction for Transaction VA01, so when they create a sales order with a material that has for example 10 units in stock and if they are requesting 15units through call transaction they want "Availability Control" screen be showed in order to select the amount of 10 units(which only are available) instead of 15units, this is due that....when they have this scenario with materials stock and it's saved sales orders....in tab Procurement/ field Confirmed Qty is zero instead of 10 unit at least.
I hope You could help me! 
Thanks a lot in advanced .
Regards.