Quantity Contract quantity updation

Dear experts,

For a Quantity contract of 50 TO the subsequent release order was created for 50 TO and only 25 TO was delivered and billed.The release order was closed with a reason for rejection.

Another release order was created with reference to the QC for 25 TO and was delivered and billed.

Now the Quantity contract still shows 25 as an open qty.

Kindly advise.

Regards,

RK