(with reference to PR #1739 ) Business Service Fetch when CI Changes

Server-Side Components/Script Includes/Business Service Fetch When CI Changes/README.md

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+Business Service Lookup Fetch When CI Changes
+
+This code snippet dynamically fetches and filters Business Services based on the selected Configuration Item (CI) in the change request forms. It ensures accurate service mapping, improves user experience, and supports compliance in Change Management and other ITSM workflows.
+
+Features
+-Filters Business Services based on CI relationships
+-Supports Script Includes and Client Script
+-Compatible with Change Request forms and scoped apps
+-Reusable across multiple catalog items and modules
+
+Use Case
+When a user selects a CI (e.g., server, application), the form should only show Business Services linked to that CI. This avoids incorrect selections and enforces service ownership logic. This also checks for orphaned relationships by logging the details in Sytem Logs where a CI has no linked Business Services to avoid empty dropdowns.
+

Server-Side Components/Script Includes/Business Service Fetch When CI Changes/clientscript.js

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+/**onChange Client Script on Change_Request form when CI changes */
+
+function onchange(control, oldValue, newValue, isLoading) {
+    if (isLoading || newValue == '') {
+        return;
+    }
+
+    var ga = new GlideAjax('getServiceDetails');
+    ga.addParam('sysparm_name', 'getService');
+    ga.addParam('sysparm_ci_sys_id', newValue);
+    ga.getXML(callScriptInclude);
+
+    function callScriptInclude(response) {
+        var answer = response.responseXML.documentElement.getAttribute("answer");
+
+        if (answer) {
+            // Set the Business Service field with the service name returned
+            g_form.setValue('business_service', answer);
+        } else {
+            // Optional: show a message if no service is found
+            g_form.showFieldMsg('business_service', 'No linked Business Service found for this CI.', 'info');
+        }
+    }
+}

Server-Side Components/Script Includes/Business Service Fetch When CI Changes/scriptinclude.js

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+/** Client callable script include named getServiceDetails*/
+
+var getServiceDetails = Class.create();
+getServiceDetails.prototype = Object.extendsObject(AbstractAjaxProcessor, {
+
+    /**creating a script include function named getService */
+
+    getService: function() {
+
+        /**getting the sysid of CI from client side */
+        var ciSysId = this.getParameter('sysparm_ci_sys_id');
+        gs.log('[getServiceDetails] Called for CI: ' + ciSysId);
+
+        if (!ciSysId) {
+            gs.log('[getServiceDetails] No CI sys_id provided.');
+            return '';
+        }
+
+        /**Querying the cmdb_rel_ci to find parent relationships for the CI */
+        var relGR = new GlideRecord('cmdb_rel_ci');
+        relGR.addQuery('child', ciSysId);
+        relGR.query();
+
+        while (relGR.next()) {
+            var parentSysId = relGR.getValue('parent');
+
+            /**Check if the parent is a Business Service (cmdb_ci_service) */
+            var bsGR = new GlideRecord('cmdb_ci_service');
+            if (bsGR.get(parentSysId)) {
+                var businessServiceName = bsGR.getValue('name');
+                gs.log('[getServiceDetails] Found Business Service: ' + businessServiceName);
+                return businessServiceName; // Return the name of the businessService
+            }
+        }
+
+        gs.log('[getServiceDetails] No linked Business Service found.');
+        return '';
+    },
+
+    type: 'getServiceDetails'
+});
+
+