How to change the encoding in OFTP sender adapter

Hello,

I have the following problem: the customer sends a EDIFACT file in ISO-8859-2 format via OFTP sender adapter. The header of the XML file looks like this:

When the file reaches the mapping step I am receiving the following error message:

If I manipulate the header manually like this

the mapping is no problem.

My question: is there an easy way to change this setting before the message mapping step starts?

Thanks a lot for your help!

Best regards

Christian