Sybase SQL Anywhere 12.0.1.4127

This script to reproduce the problem:

CREATE TABLE "DBA"."TEST" (
        "ID" INTEGER NOT NULL,
        "FIELD1" CHAR(10) NULL,
        "FIELD2" CHAR(10) NULL,
        PRIMARY KEY ( "ID" )
)
go

CREATE FUNCTION "DBA"."MYFUNC1"(in cVar char(10)) 
RETURNS char(10)
DETERMINISTIC
BEGIN
 DECLARE cRetOut char(10);
 SET cRetOut = cVar;
 RETURN cRetOut;
END
go

Execute SQL-query

select distinct
 ID,
 FIELD1,
 FIELD2
from dba.TEST
order by dba.MYFUNC1(FIELD2)

why the error occurs:

Could not execute statement. Function or column reference to 'dba' in the ORDER BY clause is invalid SQLCODE=-854, ODBC 3 State="42000"

although if you run the same query, but in the section "order by", specify the UDF without owner, there is no error:

select distinct
 ID,
 FIELD1,
 FIELD2
from dba.TEST
order by MYFUNC1(FIELD2)

At the same time in Sybase SA 8.0.3.5594 both SQL-query executed without error.