Story Book 534 🚀 | CAPM Day 25 Today I learned an important enterprise API design concept while working with SAP CAP and OData V4. Initially, my PurchaseOrders entity stored simple text values like: productName supplierName That approach works for small demos, but it is not how enterprise systems are usually designed. So I redesigned the model using Associations. Now: PurchaseOrders → references Products → references Suppliers instead of storing duplicate text values. After that, I tested the OData $expand query: /odata/v4/enterprise/PurchaseOrders?$expand=product,supplier This allowed a single API call to return: ✔ Purchase Order data ✔ Related Product details ✔ Related Supplier details in one response. What I understood today: Without $expand → APIs mostly return IDs/references With $expand → APIs can return connected business context This is important because real enterprise applications depend heavily on: relationships between business objects navigation across data models reusabl...