Working in 7.2.1, we have a repeating grid with checkboxes where none are selected initially. We want to include a validation to require at least one of the checkboxes is checked before submission. Working from a previous example (https://pdn.pega.com/community/pega-product-support/question/how-do-validation-repeating-grid) we were unable to follow exactly where the when rule should be created and where the rule using it would be instantiated. Any clarifications (we are new to Pega) with more specificity would be greatly appreciated.
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At a high level, we understand those ways, but we are having difficulty with the specific implementation.
In that forum, it was instructed to create a "when" rule, then use that rule in the validation. We were unclear exactly how to set up that "when" rule, and the proper usage of said rule when setting up the validation. Any specifics on these points would be greatly appreciated.