One of the biggest absurdities about ERP systems springs from the very word we use so often when describing ERP: integrated.
ERP is an integrated system: it integrates all data and processes into a single application. Different modules look over different aspects of data and processes, but a change in one module automatically reflects in all others.
A fantastic concept. When it was invented, it streamlined processes, boosted productivity and eliminated overhead and error.
So, whenever a new functionality is needed by a company, it should be integrated into the ERP, to benefit from the integrated system. Right?