Your first user business rule script

A user business rule owns an event-driven script. The rule, not an API request, determines when it runs. Its subject is the entity that triggered the event.

Create or edit a User Business Rule for the Crm.Sales.SalesOrderLines repository.
Configure the rule's event, for example COMMIT, and complete the other required rule settings.
Select JavaScript as the script language and enter this script text:

if (subject.Quantity != null && subject.Quantity.Value % 1 !== 0) {
    Action.cancel("Enter a whole-number quantity.");
}

Save and activate the rule, then try to save a line with a fractional quantity.

The script uses the triggering line directly; there is no managed-script args object or parameter schema. Action.cancel stops the operation with the given message. The configuration guide explains the rule fields, and business-rule examples show other event-driven patterns.

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Your first user business rule script