iDoc basic type FIDCCH01 with error F5866

Iu2019m trying to create an iDoc with basic type FIDCCH01 and message type FIDCCH type. Iu2019m getting error F5866 u201CWhen calling up the interface to financial accounting, no entry was made in the transfer parameter "Application key" when I process the idoc. I do not see an idoc value by this name. What am I missing in my config?

Thanks,

Stan