Rules can only be defined to influence fields of a specific master data model. This means, for example, that rules defined according to the fields of a placement can only be checked for other fields of a placement (but not for a customer or other master data).

An if... -part consists of a "Field OPERATOR Value" clause in which Field is an attribute of the master data. The operator can be equal, unequal, greater than, greater than or equal, less than, less than or its EQUAL, IN, NOT IN.

A then... part consists of triggering an error / warning message.

A rule can have multiple if ... parts as long as they are combined as AND conditions and only one then ... part. That is, if the same set of if ... Split several then ... parts, then for each then ... part, a rule must be defined for each then ... part.