quantity contract issue

Hi,

Suppose i created a quantity contract of 100 quantity now when i am creating an order with reference to that contract with quantity 200 no message is coming that ur quantity exceeds.

In item category of contract i use C as completion rule field.And in copy control i use 2 in update document flow and + sign in postive/negative quantity field.

Any thing else i need to do.

Regards,

Murty