Hello
Are you trying to do the Goods receipt.
The message says that you are trying to do the Goods receipt again the production order created with the CO07 t code.
In the dis-assembly case (production order with CO07) , generally we are not doing any Goods receipt, we only do the Goods Issue.
Try Goods Issue only. MIGO -> Goods Issue -> Order (production order)
Hope this may help
Confirm if you face any problem 
Regards
SS