Rework order

Hi

I had creted production order for 10 pcs.. I am confirming operationwise.During my second operation ie 020 my yield qty is 5 pcs and rework is 5 pcs.

I had created rework order using co07 and with reference operation set with control key PP07.

I confirrmed my rework order 5 pcs for operation 20

so now total yield quantity for operation 20 is 10

When i want to confirm my operation 30 its allowing me only for 5 pcs....I want to confirm total 10 pcs

Can you tell me the solution..

Regards,

srihari