Allows selecting an existing Rule to apply to the current data column. Refer to the Database Design – Rules chapter for details on Rules.

To apply a Rule, the entity on which the rule is defined must be set either by row or by column. If it is set by row, it is possible include another entity by row but only if it is not hierarchically related to it and as a grouping entity (set this entity first, then the one on which the rule is defined). For example, if a Rule is defined on the entity ProfitAndLoss and then you can set the this entity by column or row. If you set it by row you can also set another independent entity for example Month-ProfitAndLoss, but not ProfitAndLoss -Month.