diff --git a/server/rr/rr-service-vehicles.js b/server/rr/rr-service-vehicles.js
index e16dcb89e..6808a246d 100644
--- a/server/rr/rr-service-vehicles.js
+++ b/server/rr/rr-service-vehicles.js
@@ -121,10 +121,13 @@ async function ensureRRServiceVehicle(args = {}) {
   }
 
   // --- Attempt insert (idempotent) ---
+  // IMPORTANT: The current RR lib build validates `vehicleServInfo.customerNo`.
+  // To be future-proof, we also include top-level `customerNo`.
   const insertPayload = {
     vin: vinStr,
-    customerNo: custNoStr,
-    license: license ? String(license).trim() : undefined
+    customerNo: custNoStr, // fallback form (some builds accept this)
+    vehicleServInfo: { customerNo: custNoStr }, // primary form expected by the lib
+    vehicleDetail: license ? { licNo: String(license).trim() } : undefined
   };
 
   const insertOpts = {