Version 9.4 CREATE FUNCTION - ERROR: type xxxx does not exist create function

Given this function body:

DECLARE
   recurrence Client_Appointment_Recurrences;
   ...
BEGIN
   ...
END

and a table called "Client_Appointment_Recurrences", the message is
"ERROR: type client_appointment_recurrences does not exist".

Rename the table to "client_appointment_recurrences" and the error vanishes

Regards

Nicole