Final answer:
When a user violates a data validation rule, a message such as a 'Stop' or 'Warning' is displayed. These messages help maintain data integrity by enforcing predefined rules.
Step-by-step explanation:
When a user enters data that violates a data validation rule, typically a message appears to indicate the error. This functionality is commonly part of data entry forms in software applications. The type of message that appears can often be configured, but two common types of messages are:
- Stop: This type of message is a strict enforcement where the entry is completely blocked until the error is corrected.
- Warning: This message alerts the user to the problem but may allow them to continue, leaving the responsibility to address it or not.
Essentially, these messages serve to maintain data integrity and ensure that all entered data conforms to the predefined rules or formats required by the system.