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3 weeks ago
UI Policies override Client Scripts: UI Policies always execute last and win any conflict.
Mandatory wins over Read-Only: ServiceNow never allows a field to be both. It prioritizes mandatory so users can still enter data.
The Result
When Empty: The UI Policy forced the field to be mandatory, overriding the Client Script's read-only rule.
When Filled: The UI Policy stopped acting, allowing the Client Script to successfully make the field read-only.
Best Practice
Delete the Client Script and use one UI Policy with the condition Field A is not empty to handle both states automatically.
