Converting StringValue (base64binary) in SOAP request to SOAP attachment to receiver

Hi Gurus

We have a synchronous interface which is transferring a field on the SOAP request which has the files in base64binary format.

I would like to know - how we can convert these to SOAP attachments to the receiver system.

Can we do this using  a UDF / Java mapping - wat are the parameters we need to configure.

Scenario:

Request message  :

• External vendor (SOAP XML with Attachment)<<-----PI(Need to convert 1 field base64binary field to SOAP Attachment)<<----Internal 3rd party application (SOAP XML Payload with 1 field having base64binaryfomatfile)

Response message :

• External vendor    ---------------------------------------->>(only Data)---------------PI----------------------->>(Only Data)---Internal 3rd party application .

How can we convert the field which is carrying the base64binary characters in to a SOAP attachments and pass it on the SOAP request to the reciver system in the above scenario - can this be achieved just by a UDF - or do we need addl. configuration at the SOAP adapter as well ?!

Your help is greatly appreciated!!

Thanks,

Ritu