Production order combine auto GR.

Hi PP guys,

  I created 1 combine production by add 2 other production order, in production order confirmation, i am not able to get delivered qty of both child orders, in 1st operation bom components consumed but no auto GR for header material , what other setting to be check ? while doing Auto GR through MB31/MIGO system does not allow for GR .my control key is PP03 in order.

Pl provide solution .....;its urgent for client.

thanks in advance.

Amit Awasthi