Error for scalar schema for remote service

I have scenario where I have two GraphQL schema on two different services and these schema I'm stitching on a GW service. We build the schema on the gateway at runtime using the introspection and merge them.

QueryExecutorSchemaSource.builder[Object]
  .namespace(nameSpace)
   .schemaLoader(new HttpRemoteIntrospectionLoader(....
   .remoteRetriever( new HttpRemoteRetriever(......
   .links(buildLinks(m))
  .queryFieldRenames(buildQueryFieldRenames(m))
  .mutationFieldRenames(buildMutationAliases(m))
  .typeRenames(buildTypeRenames(m))
  .documentMapperFactory(buildDocumentMapperFactory(m))
  .build

There are few scalar schema on these services which the GW doesn't recognise so it throw error. So is there a need for the gateway to understand these types. Since it's just fetches and passes the data along?

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