Assignments in X3 - linking a WO to a PO for a report

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I am on v6.5 and trying to write a simple Crystal report linking a WO and its required components that are on a PO.  My issue is I cannot find the "link" between the WO and the PO.  I have used the assignments workbench to link and to force allocate the PO to the WO.  I have studied the ORDERS table. My PO is there and my WO is there. BUT I cannot find a link between the two (as the WIPNUM is different).  X3 must be writing something to a table somewhere as the assignment workbench screen shows the link between the two on the screen.  Thanks for your help.