VL10B - Delivery doc number and PO# held where?

[Sample, Rick]

I have a need to get the Delivery Document number and 
the PO number after I run VL10B. 

I checked a few tables but I am not seeing a link.

Tables checked. VBSS, VBFS, and VBSK. But I do not see a link between 
the PO number and the Delivery number. 

Rick Sample
SAP Business Workflow Developer
Graybar, Inc.