Purchase order number for the Delivery

How do we get the Purchase order number from a delivery.

Hello all

Say i have an Purchase order [EKKO] and from that i have created a delivery.[LIKS]

In my output for the delivery, i need the preceeding document number for the delivery which is the PO number.

How do i get the same. what table should i look in. I checked the VBFA table, but i am not able to get the same there...

is there any table with which we can get this info.

thanks and Regards,

Gauravjit.