There are several ways to check that manual changes are not violating rules in the schedule.
Validate entire schedule at one time:
Go to Scheduling > Edit Schedule > Date View (or Month View)
Click on blue icon with the triangle and exclamation point above the calendar options.
Any assignment that validates rules will show a yellow triangular icon with an exclamation point.
Hover over any yellow icon to view broken rules for the assignment.
Auto-Validation of Schedule:
Using auto-validation will run validation on all new or changed assignments.
Go to Scheduling > Edit Schedule > Date View (or Month View)
Click on Display Filter.
Under Validation on the right side click on Disable until it changes to Auto.
Make changes as needed.
Note – To keep this functionality save the filter as a personal filter.
Single Validation of Assignments:
Go to Scheduling > Edit Schedule > Date View (or Month View)
Click on an assignment to open assignment pop-up.
Click on Validate Changes at the bottom.