If you have too many manual integration points and staff are forever reconciling data from one system to another, often with no answer for the differences in the numbers, then you can’t trust the system.
This situation means it’s near impossible to deliver the timely analysis and reporting as demanded by your business partners.
It’s vital to have one source of truth and one point of transaction entry so that you can trust the data you analyse and trust the P&L numbers generated from them.