5 Things Developers Miss About ERP Module Coupling

5 Things Developers Miss About ERP Module Coupling Most developers who've worked on an ERP system will say the same thing at some point: "The modules are supposed to be independent — so why is everything breaking when I touch one?" Module coupling in ERP systems is one of those problems that looks solved on paper and turns into a maintenance nightmare in practice. Here are five things that tend to catch developers off guard. 1. The database is the hidden coupling layer The most common assumption is that modules are decoupled if they don't import each other's code. But if sales_order and inventory both write directly to a shared products table, you haven't decoupled anything — you've just moved the dependency underground. Schema changes in one module silently break another. 2. Business logic leaks across module boundaries ERP modules almost always share domain rules , not just data. "Can this order be fulfilled?" sounds like a sales question — but the answer lives in inventory, finance