Deleting or omitting Special characters in PI mapping

Hello ,

My scenario is , SAP ECC to legacy , ie. IDOC --> XI/PI -BPM --> Legacy(XML) ,

here in Idoc we have a field which gives has a special character '§' which I need to remove this before it goes out from PI.

how to handle this , Is there a best way to do?

Note : From legacy they can handle other character but legacy system could not accept this char.

Regards,

Sethu.