Production order in APO at header material vanishes once the order is released in ECC

Hi,

While the production order in ECC is released in ECC, it is not seen in APO at header material, earlier it is seen once created in ECC.

the issues is, the confirmations of such orders are not updated in APO with an error 'No main material defined' an inbound queues in APO, logically yes at the order is not present in APO at header now, has any one face the same issue..?

Regards,

Ritesh