Hi Srikanth Satakopan,
I think that you always choose between two approaches - balancing the allocations 100% against the GL, and balancing against the consumption of IT services.
The latter approach requires setting fixed unit rates to be able to translate consumption to cost.
This approach is useful if you're trying to get to an App TCO that reflects reality more closely and consistently.
The trade-off is that you'll always be under or over-allocating compared to the GL, but hopefully on a FY or YTD view, the differences shoukd not be huge. You would of course need to have a set of reports to be able to explain the differences and in order to help you set more accurate unit rates over time.
Another approach you could consider is "restating history", by showing the cost of the accruals and reversals in the month that the services were recieved. However, this makes all reports "tentative" because they can always change next month, making them not very effective for decision making.
So, I think it's a question of who your audience is. LOBs and service owners will typically not care too much about the GL; they want to make decisions based on consumption and "real time" cost.
On the other hand, any report shown to finance must eventually tie to the GL in order to make sense.
Thanks,
Guy