What is a key feature of Validation rules in Planning?

The correct choice highlights a fundamental aspect of validation rules in Planning. Validation rules are designed to assess whether the data conforms to specific criteria or standards before further processing or approval. A significant capability of these rules is their ability to incorporate user-specific variables during validation. This means that when a validation rule is executed, it can take into account the values or settings defined by the user and replace them as needed, thus ensuring the validation process is dynamic and reflective of each user's context.

While other options suggest certain limitations or specific contexts in which validation rules might operate, they do not encapsulate the core functionality that distinguishes them. The ability for validation rules to validate with user variables replaced enhances flexibility and adaptability, making them a powerful tool for ensuring data integrity tailored to individual user scenarios. This feature allows for a more personalized and context-aware validation process, enabling organizations to maintain data accuracy across diverse user inputs and sets.