Prevent closure parent incident when child incident is open

Server-Side Components/Business Rules/Abort Parent Incident Closure When Child is Open/README.md

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+This business rule is designed for ServiceNow to prevent a parent incident from being closed or resolved while it still has active child incidents.
+If a user attempts to set the parent incident's state to "Resolved," "Closed," or "Cancelled," the rule will query for any related child incidents that are still open. 
+If open children are found, the update will be aborted, and an error message will be displayed to the user.
+
+Navigate to System Definition > Business Rules in the ServiceNow filter navigator.
+Click New.
+Fill out the form with the following details:
+Name: Prevent Parent Closure with Open Children
+Table: Incident [incident]
+Advanced: true
+When: before
+Update: Check this box.
+In the When to run tab, set the Condition field:
+current.state.changesTo(7) || current.state.changesTo(6) || current.state.changesTo(8)
+Note: The state values (6, 7, 8) may vary based on your instance configuration.
+In the Advanced tab, paste the provided script into the Script field.

Server-Side Components/Business Rules/Abort Parent Incident Closure When Child is Open/scriptBR.js

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+(function executeRule(current, previous /*null when async*/ ) {
+
+    // Query for any child incidents related to the current parent incident.
+    var childIncidents = new GlideRecord('incident');
+    childIncidents.addQuery('parent_incident', current.sys_id);
+    childIncidents.addEncodedQuery('state!=6^ORstate!=7^ORstate!=8');  // state is not closed,Resoved,cancelled
+    childIncidents.addActiveQuery();
+    childIncidents.query();
+    // Check if any open child incidents were found.
+    if (childIncidents.getRowCount() > 0) {
+        var childNumbers = [];
+        while (childIncidents.next()) {
+            childNumbers.push(childIncidents.number.toString());
+        }
+        // Display an error message with the open child incident numbers.
+        gs.addErrorMessage('Cannot close this incident. Please close the following child incidents first: ' + childNumbers.join(', '));
+        //prevent saving the record
+        current.setAbortAction(true);
+    }
+
+})(current, previous);