What about previous question:
Is the order from the asset master set in the asset line item during posting or not?
Regards, Michael
PS.: If you're posting asset acquisition via GR (transaction MIGO) or IR (MIRO) also check if the order is correctly set in the PO item. The field "order" has to be filled also in the PO if you want it to work correctly. Normally the order in the PO is automatically copied from the asset. So check if this works.