Hi,
1)Please make sure that you have publication type maintained for inhouse production with "retransfer" option in /sapapo/cp1, /sapapo/cp3 transactions.
2)Run CCR report and check if you are able to reconcile the date difference?
3) Make sure that the operation data is consistent in the orders in ECC and APO system
4) Check if the PDS / PPM is consistent with no data missing between ECC and APO system.
The above points should help you solve the issue
Thanks
Gomathi