Validations and Validation Groups 

MDM validations are MDM expressions that return a Boolean success or failure result. Using MDM validations, you can define complex tests for all types of conditions, and then run those tests against a group of one or more records, all without using a query language.

You can also assign each validation to one or more validation groups. Each validation group is a set of validations that can be conveniently executed as a group with a single selection rather than forcing you to run each individual validation separately.

For more information about validations, see Validating Records.

Validation groups allow you to organize large sets of related validations, eliminating the likelihood of forgetting to run any of the individual validations in the group.