Issue #3359840 Fixed issue with retrieving record with multiple keys

src/EventSubscriber/ExportLocalEntityMapping.php

@@ -81,7 +81,11 @@ class ExportLocalEntityMapping extends ExportLocalEntityMappingBase {
     try {
       $object = $this->clientFactory
         ->getByClientConfig($entity_mapping['client'])
-        ->getByKeys($key_values);
+        // The OpenAPI-generated clients concatenates keys provided as an array
+        // using `,` before using them in the URL, while Acumatica actually
+        // expects them separated by `/`. Do this here and provide all keys as
+        // if it were one to avoid this problem.
+        ->getByKeys([implode('/', $key_values)]);
     }
     catch (\Throwable $throwable) {
       if (!$throwable instanceof $exception_class) {