DFHPI9606E value of the XML encoding attribute must match that of the under lying file system

Question

Is there something special that could cause a WSDL to require EBCDIC encoding to be specified while others do not? Our application developer is using our processes to create a requester web service from a WSDL using DFHWS2LS. I normally have the developers remove the encoding parameter from the WSDL prior to processing. Since the WSDLs come from Windows, they usually have encoding=UTF-8, that they are instructed to remove when the file is transferred to z/OS. Even when doing this, the assistant gave this error:

DFHPI9606E The value of the XML encoding attribute must match that of the underlying file system. For example, the value "EBCDIC-CP-US" may be appropriate.

I was able to alter the WSDL to use encoding=EBCDIC-CP-US and get the assistant to work. This has not been done in the past, and I tried a WSDL of another CICS web service and was able to process it without encoding by simply having <?xml version="1.0"?> at the beginning of the WSDL.

I have a WSDL that has been previously used and does not include the encoding. I was able to use it without any alteration.