Your numbers
Rough figures are fine. The point is the order of magnitude, not the decimal.
Sales admin, billing, stores, accounts — anyone who types things into a system.
Fully loaded, not salary — usually 1.3 to 1.5 times base.
Entering something that already exists in another system or sheet.
Month-end reconciliation — everyone who touches it, added together.
Credit notes, double-billed deliveries, stock promised that was not there.
The write-off plus the time to sort it out. A rough figure is fine.
What that adds up to
₹5,93,455 — about 1,536 hours of people's time, plus what the errors cost.
Yours to set, and it should never be 100. Some re-entry is real work, some errors are human, and a system you have just installed is one nobody is fast at yet. We would plan on the low end of this slider, not the high end.
Start with: errors that reach a customer
It is your largest line at ₹2,88,000 a year. Fixing the biggest one first is also how you find out whether the rest of the estimate was right — consolidate the two systems that argue most, run a quarter, and check whether those hours actually fell before spending anything more.
Your figures travel with the enquiry, so the call starts from them rather than from a blank form.
How this is worked out
An hourly cost from the monthly one, at 176 hours a month — 22 working days of eight hours. Re-entry is that hourly rate across your people, every week of the year. Reconciliation is the month-end hours, twelve times. Errors are simply the number a month times what one costs, times twelve. Then the share you decide is recoverable.
Three things it deliberately leaves out, all of which push the real figure up rather than down. The decisions nobody got to make well, because the question would have taken a day to answer and so was never asked. The customer who quietly went elsewhere after being told two different things in one week. And the key-person risk in having one person who understands the reconciliation.
It also leaves out what an ERP costs, because that depends on how many modules you switch on, how far your process sits from the default, and how clean your master data is. What an ERP actually costs an Indian SME goes through those five drivers properly, including the one that is usually largest and never quoted.