Encoding problem with custom send pipeline

Hi!

I have an issue with the encoding of french characters with Biztalk
2006 R2 and HL7 accelerator 2.0.

I created a custom receive pipeline and I configured the encoding
charset to Western Europe (1252). The message arrives good and I
stucked the xml representation of msh and body in a sql server
database.

Then I have an orchestration that takes the message from the database
and then transform the xml into HL7 inside the orchestration.

The problem is when it enters in the first custom pipeline component,
all the characters are still ok but when I passed thourgh the
assembler, then I lose french characters for '?'. I can see it in a
custom pipeline component that I use in the coding stage.

Here is the call to the pipeline in the orchestration in a construct
shape:

// the xml_doc is different for msh and body
// Here the message is perfect
res_labo_final.MshSegments = xml_doc;
res_labo_final.BodySegments = xml_doc;
res_labo_final.ZSegments = "";

res_labo_final(BTAHL7Schemas.MessageClass) = "MessageClass2X";
res_labo_final(BTAHL7Schemas.MessageEncoding) = 1252;
res_labo_final(BTAHL7Schemas.SegmentDelimiter2Char) = true;
res_labo_final(BTAHL7Schemas.ParseError) = false;
res_labo_final(BTAHL7Schemas.MSH1) = 124;
res_labo_final(BTAHL7Schemas.MSH2) = "^~\\&";
res_labo_final(BTAHL7Schemas.MSH3_1) = "RR_Intrf";
res_labo_final(BTAHL7Schemas.MSH5_1) = "LabMicRes";

msg_HL7_pipeline = new
Microsoft.XLANGs.Pipeline.SendPipelineInputMessages();
msg_HL7_pipeline.Add(res_labo_final);

msg_result = null;
Microsoft.XLANGs.Pipeline.XLANGPipelineManager.ExecuteSendPipeline(typeof(EnvoiDCIOrchestrastion.Pipeline_send_DCI),
msg_HL7_pipeline, msg_result);

// Here some characters are replaced by '?'

Somebody have an idea why it does that ?

Thanks a lot

Benoit