Balance Rollup (with ALE-Idocs) as well as normal transactions

Question

Hi,
We have two Systems, say A and B. The System B is a centralized system and has many Company Codes. Company Code 1000 operates out of System A. In order to facilitate consolidation, the Company Code is also created in System B and there is a Balance Rollup (using Idoc FIDCMT) from System A to System B.
In this scenario, what happens if an accounting entry is directly posted in Company Code 1000 in System B? In other words, how would the IDoc determine the delta amount to be posted when the rollup happens after such a direct posting?
Example:
System A. GL Account 100102 has a Dr. balance of I00.
Balance rollup happens and this automatically creates the Dr. balance of 100 for the same GL Account in Comp Code 1000 in System B as well.
Subsequently, I pass an entry debiting Gl Account 100102 with 20 in System A.
I pass another entry in the same GL Account in Co Code 1000 in System B debiting it for 5.
Now, I execute the rollup.
The total new balance for this GL Account in System A is 120.
How and what will the Idoc determine as the delta to be posted? 20 (120-100) or 15 (120-105)
If it is 20, on what basis will the system not consider the additional debit of 5 directly done in System B?
Thanks and Regards
Sriram Sampath

Answer 1

You'd need to determine the b/f then apply it against the
transaction records when they are pulled for a date range. So if
the date range is
Feb 1st, 2009 -> Feb 28th, 2009
You'd need to also get the previous balance in a separate
query, then use it to correctly display the running balance when
you output the date range.
I suppose a simpler way involving a little more DB work (and
possibly lots of coding) is to store the current balance as well
with each transaction; then when performing a date range you'd have
the balance as well and not have to calculate it on the fly.