MDS has a core concept known as validation, which is the process of running pre-defined MDS Business Rules against each member within an entity. We will cover the Business Rules that run as part of validation in detail in Chapter 7, Business Rules and Workflow.
Validation happens for a single member when a member is added or edited, and for all members in all entities of a model when the version is validated from the Version Management function that we are currently focused on.
Validation does not happen when changes to members are made directly in the Explorer grid. In this case, members are marked as awaiting validation, which is explained next.
The validation status of a member can be one of five states, ...