Confirmed Quantity field in Sales Order Schedule line is empty

Dear all,

In the schedule line tab of standard sales order 'OR' the "confirmed quantity" field is empty, and i am unable to enter the quantity manually as well. It should be equal to the ordered quantity.

I am using the schedule line category CN (No Material planning). and i have created my own sch. line category ZN (with no availability check). both are assigned to item category TAN.

What could be the problem?

Please help.

I will be very thankful to you guys.

Regards,

Faraz H. Qazi