ServiceNow Tips: Update Parent Record Variables from MRVS Selections

[Siddhesh Gawade]

Introduction
When building catalog items with Multi-Row Variable Sets (MRVS) in ServiceNow, you often need to propagate a selection/change inside a MRVS row to variables/fields on the parent Record. MRVS variable scripts run inside an iframe; to read or write the parent record's variables or fields you must use parent.g_form

Example — How It Works

• Concept: Read the current MRVS row values with local g_form.getValue('variable_name'), and set parent RITM variables with parent.g_form.setValue('variable_name').

• Minimal OnChange Catalog Client Script example on MRVS:

  function onChange(control, oldValue, newValue, isLoading) {
  if (isLoading || newValue === '') return;
  
  // read row-level values (local g_form)
  var Account= g_form.getValue('company');
  
  // set parent RITM variables so the values are available on the Parent form / RITM record
  parent.g_form.setValue('selected_company', Account);
  
  }​

Summary

• Use parent.g_form inside MRVS client scripts to read/write RITM variables and keep MRVS state synchronized with the parent record.

• Workflow-friendly pattern: read row values (local g_form), modify MRVS JSON on the parent, then update parent variables via parent.g_form.setValue(...).

• Keep parsing safe, avoid heavy logic on the client, and use server-side validation for authoritative checks.