How to pass file reference directly to ERP Integration Service (import Bulk Data operation)

Summary

I am using SOAP Adapter to call import Bulk Data operation of ERP Integration Service and it is asking base64 format content. I have file reference and I want to pass reference to invoke import

Content

Hi Experts,

I am using SOAP Adapter to call import Bulk Data operation of ERP Integration Service and in mapper it is asking BASE64 format content of the file. I have file reference and I want to pass reference directly.

Is there any way to pass FILE REFERENCE directly to this service ?