[singingfish]

My thoughts on this having worked in a team doing an ERP (think SAP lite) and now working in a sap shop (my job often involves avoiding interacting with SAP to the maximum extent possible):

ERPs are hard. ERPs are not software for modelling business processes, they are software for creating software that models business processes. And at the next layer you have all of the shortcuts that the vendor and the customer took during getting something that works out the door. Which happens a lot, at both levels. This is of course a recipe for fun interesting times with lots of billable hours.