accounting assignment objects 'tab' in purchase order is empty

Hi Experts,

Pls need a help,

1) Create request order in ECC 6 with accounting assignment .

2) The request order is transfered to SRM as shopping card.--> In the SC i can't see the accounting assingment.

3) I create from SC a purchase order. This one is created with accounting assingment tab empty.

Maybe sometingh missed in the customizing?

Thanks