Before Business Rules in ServiceNow are designed to execute just before a database operation occurs. Using these rules to perform update() or insert() operations on other tables can lead to serious data integrity issues and unexpected behaviour in the system. These operations might bypass other important system processes or validation rules, resulting in inconsistent data states and complicating transaction handling.
Resolution Steps:
Modify Before Business Rules: Either remove the update() or insert() operations directly if they are not essential or modify the rule to execute 'after' the transaction if the updates or inserts must occur and can be safely deferred until after the primary record operation.
Test the Changes:After modifications, thoroughly test the affected business rules to ensure they perform as expected without causing side effects.
Implement Best Practices Going Forward:Establish guidelines that prohibit the use of cross-table update() or insert() operations in 'Before' business rules.
Bad Practice Example:

Preventing cross-table updates in Before Business Rules is crucial for maintaining system stability and data integrity in ServiceNow. By adhering to this best practice, organizations can avoid many common pitfalls associated with record processing and ensure that all data transactions are handled in a consistent, predictable manner.
For more detailed guidance on resolving this issue, please contact us at support@dt-advisory.ch.