I set a validation rule for a date. Range greater than or equal to a different attribute. Did not set the smaller or equal option. But when deployed no matter what date i select mendix is not happy and the validation error persists. When trying to use the smaller option as well it doesnt work either. There seems to be a bug. What I am trying to achieve is that date A is always smaller equal to date B AND date B is always greater than or equal to date A does not work!
You could solve the issue with a microflow that checks the fields before commit and provides the validation feedback as a work-around.
The validation with ranges indeed always will return feedback, I hope you filed a bug report for this.