Supply chain planning processes are highly interconnected. Sales and operations planning (S&OP) impacts production scheduling. Production scheduling impacts capacity planning and inventory management. Order promising is impacted by all stages of supply planning, and on and on it goes. ERP suites provide separate modules, almost always with different data models, for each of these functions. Beyond ERP, you may have multiple point solutions that are part of the mix.
You are faced with different user interfaces and integration among the modules for end-to-end demand and supply chain management. Additional modules or solutions are required to exchange information with your customers and suppliers, with an emphasis on transaction management rather than decision making. And yet another module is required to create forward-looking financial reports for operations management.
Even if integrated, all these siloed solutions offer little to no what-if analysis capabilities, so not only is data consolidation difficult, but actual analysis is near impossible without significant assistance from Excel and ample time and resources.