I think many people who have work experience and reply to discussions are really sharing their experience in their answers. They have no reason to beat around the bush. If you read attentively the replies then you can see who is talking experience or just sharing theory.
The blogs and documents should be used to share proactive the experience. I would love to see more blogs about real projects too, instead of help.sap.com write ups.
However, it is not easy to write such blogs, to fit the experience of a 50 days archiving project into 3 page blog. Talking about all the obstacles from the beginning to the end may be nice to share but probably not be well-received by the company of the poster.
I have it in on my personal agenda, but instead of archiving I am busy with several data migration projects. And a colleague is doing archiving. Knocks at least 3 times a day at my door to ask for help. Maybe even this story will be worth a blog. While everyone is thinking that everything is well organized in the big companies, it is in reality done in passing.
Your question: what requirements to capture with process/functional teams to implement this object.
is actually the result of one or more team meetings between the technical and the functional folks.
I hope we can get a collection at the end from contribution of several people here, but I would have difficulties if I post my complete project results of those meetings 1:1 in a public forum.
Let me mention the SAP ERP Financials - Controlling
to include the people who follow the FICO forum to this question. I further tagged your discussion to get it into the related content section of the FICO space.