Precedence between data lookup, assignment, and business rules

When creating new assignment rules, keep in mind that business rules can take precedence over assignment rules in certain circumstances. Data lookup rules take precedence over assignment rules.

Data lookup rules, assignment rules and business rules run in the following order:
  1. Data lookup rules take precedence over assignment rules.
  2. All assignment rules run before business rules that run on a record insert with an order value less than 1000.
  3. The first assignment rule with the lowest execution order and matching condition.
  4. All assignment rules run before business rules that run on a record insert with an order value greater than or equal to 1000.
  5. All assignment rules run after business rules that run on record insert.