To extend what I wrote about for the Encoding for HL7 messages post. There are two values that are used for the Message Encoding context properties. It isn't obvious but follow the logic:
According to Extended Encoding Support page in the Note section of step 5 you can only choose Western European or UTF8, so if I look at the Encoding Class documentation, the table below are the values you can use:
| Value To Set | Name | Display |
| 65001 | utf-8 | Unicode (UTF-8) |
| 850 | ibm850 | Western European (DOS) |