One of them was trying to find out how the document flow could be retrieved based on a follow-up document.
I overheard some other CRM consultant starting to speak about tables...and thought there should be a better and more efficient way then reading out table relationships.
I therefore consulted my best friends Google.com as well as SDN/SCN and quickly was able to find not only the relevant tables but also a function module that might do the job.
Below you will find a document I just created illustrating a complete use case where I create an opportunity as follow-up document for a lead.
I will then use table relationships to find back the relevant preceding document based on the guid of the opportunity. Additionally I show the usage of the function module I found.