Delivery

Hi,

I created sales order of 100 qty,and made delivery for 50 qty.

and again i try to create delivery for remaining 50 qty,but here if tried to change remaining 50 qty frm 50 to 100 (i.e if u changed the remaining qty to any other qty) system allows me to do delivery of allowed qty.

I feel its copy control error,pls guide me the solutions for above.

Thank you

Hemant