Need advise to calculate stock difference (Theoric values vs real values)

I know there is a transaction named MI20
This transaction is able to give me the needed info... except it gives me the info un units. Meaning, if a box of certain product has 12 SKU and we have 12 boxes, the result window shows 144 SKU.
This is not a bad thing... except for the fact that the company does not only want to see the SKU but they want to see the boxes. If there are 145 SKU of the same product in stock, they want the result window to show it like this:
Item: <ItemName>, Boxes: 12, Units: 1 (This is a rough example)
Now... I don't think it is a good idea to touch the standard code, so I decided to create a new (and simplified) transaction that asks only the parameters they want, they agreed to this and so I started... but stopped almost right away.
"Why?" you might ask. Well, I don't know the tables I sould read to determine a difference in stock between what's supposed to be and what really is.
My common sense tells me the actual stock is somehow introduced to the system with some document. But where? Which table(s)?
Also, how can I calculate the theoric values ? Initial stock (date of implementation) minus sales, plus purchases? That's what common sense tells me but... also tells me that is only going to be slower as time passes by, not to mention I don't know where to look into (again).
After the people who implemented SAP left, we were left adrift. No data dictionary, no ABAP training, no language refference manual, no nothing :s
I don't want source code to be written here... but I'm kinda desperate, I tried to understand the standard code of the MI20 but I get lost. I'm reading the RM07IDIF report and while I can see some tables there, I can't ger a grip on what's happening >___<
What would you say is a good starting point or course of action? (Don't say "Get formal ABAP trainning"... that's not going to happen, my boss haven't even pressed the buttons to get a book from the SAP store ;_;)
I know the ISEG, MARA, T!58 tables play a role in the whole movie (How, that's still a mistery I have to unveil).I I've also noticed some structures that (to my understanding) are used mostly to store partial results.
I know this question is very vague and even might look like "Do the work for me", but believe me, I'm not looking for source code to copy paste. I'm trying to understand the system and the relation between the tables in order to start coding.
Thanx in advance for your help and understanding : /
Edited by: Compiux on Feb 17, 2012 12:05 AM
Edited by: Compiux on Feb 17, 2012 12:06 AM
Edited by: Compiux on Feb 17, 2012 12:07 AM
Edited by: Compiux on Feb 17, 2012 12:07 AM

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Attachments:
Unbenannt 2.vi ‏8 KB

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