Change XML encoding of the serializated iDoc (camel-sap)

Hello.

I'm using JBoss Fuse (6.3.0.redhat-187) with the camel-sap component (6.3.0.redhat-310 ). I have some camel routes to send and receive iDocs to a SAP system. To do that, I'm following the Redhat documentation about SAP Component

I am able to send and receive iDocs serializated to XML.
The problem is the prolog of the generated XML is always ASCII

and I don't know how to change it.

¿How I can change the encoding? ¿It is this a problem related to the camel-sap component or I should edit something in the SAP System?