You could also say "goods flow", but I think this sounds better. It presumably refers to stocks of raw materials and finished and semifinished goods. The Regeln are rules set by the company or the system, rather than regulations as you suggest.

"Inventory flow represents the system companies use to move consumer products or raw materials through the company. Manufacturers, restaurants, retail stores, distribution centers and grocery stores are just a few examples of companies that have inventory flow. These companies often develop a set of procedures to consistently use when managing inventory."