When you attempt to save your invoice changes, all fields are validated against existing validation rules. Each time record in error will be highlighted in red, and all errors found will be listed at bottom of form. You can click into any field in error and make your corrections, or you can double click the error message and you will be taken directly to that field to make your corrections.
Once you correct each error only remaining messages will be shown. You can then double click the error message to jump to the next error.
