document flow tables for outbound delivery in EWM

I'm working in EWM version SAP SCM 5.10. I am trying to determine the tables or a method to access the document flow information for an outbound delivery. Specifically associated with transaction /scwm/prdo.

The functional folks have tried to find it without success. I have been researching and debugging, coming close but not finding it. If anyone has any leads, please share.

Thank you very much in advance.