Generate the title of an activity

Terrasoft.sdk.Model.addBusinessRule("Activity", {
    name: "FieldForceActivityTitleRule",
    ruleType: Terrasoft.RuleTypes.Custom,
    triggeredByColumns: ["Account", "Type"],
    events: [Terrasoft.BusinessRuleEvents.ValueChanged, Terrasoft.BusinessRuleEvents.Load],
    executeFn: function(record, rule, column, customData, callbackConfig, event) {
        if (event === Terrasoft.BusinessRuleEvents.ValueChanged || record.phantom) {
            var type = record.get("Type");
            var typeId = type ? type.get("Id") : null;
            if (typeId !== Terrasoft.Configuration.ActivityTypes.Visit) {
                Ext.callback(callbackConfig.success, callbackConfig.scope, [true]);
                return;
            }
            var account = record.get("Account");
            var accountName = (account) ? account.getPrimaryDisplayColumnValue() : "";
            var title = Ext.String.format("{0}: {1}", Terrasoft.LocalizableStrings.FieldForceTitlePrefix, accountName);
            record.set("Title", title, true);
        }
        Ext.callback(callbackConfig.success, callbackConfig.scope, [true]);
    }
});