Thank you for the opportunity to help you with your question!
rules would vary depending on the business function/operation in question. A
business rules approach is a methodology by which you capture, challenge,
publish, automate, and change rules from a strategic business perspective. The
result is a business rules system, an automated system in which the rules are
separated, logically and perhaps physically, from other aspects of the system
and shared across data stores, user interfaces, and perhaps applications.
Business rules are a formal expression of knowledge or preference, a guidance
system for steering behavior in a desired direction
Please let me know if you need any clarification. I'm always happy to answer your questions.