You may want to prevent your end users from selecting an end date that is less than the start date when creating a Change record. The steps below outline how to configure a validation rule that will not allow a save unless the EndDate is greater than the StartDate.
To Restrict Users from entering an ScheduledEndDate that is less than the ScheduledStartDate, configure a validation rule on the Change Business Object.
To do this:
Go to Change Business Object
Go to Business Rules
Go to Regular Expression Validation Rules
Add new rule
Select the ScheduledEndDate field
Expression type = Custom
$(ScheduledEndDate > ScheduledStartDate
Error Message: The ScheduledEndDate must be greater than the ScheduledStartDate
Name the rule.
This validation rule will not allow the user to save if the EndDate is before the StartDate
Upon save, user will be presented with the error message and will be unable to save until they change the EndDate to be after the StartDate: