LC0020 - If Application Area is set on the Page. Controls do not need the same classification.

This rule is only active if your apps runtime version is set to 10.0 or higher.

If Application Area is set on the Page. Controls do not need the same classification.

More info in the MS Docs:
https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/properties/devenv-applicationarea-property#remarks