Use of a stored procedure in a select statement submitted to cx_oracle

Hi,
I am developping under python and I'm using the cx_oracle interface.
I've written a stored procedure that I've tested directly under sqlplus session : it's ok. I've also tested this stored procedure from python by using callproc routine : its also ok.
Now I need to use this procedure within a select statement that I submit to the execute statement of cx_oracle as :
s = "select a.airport_name,gmlpos.ExpLatLong(a.point_name) from airport"
self.db = oracledb('ops/opeope00@ACE2008B')
dbmsg = self.db.execute(s)
IF (dbmsg == "") :
An error occurs :
Message = request = select a.AIRPORT_NAME, gmlpos.ExpLatLong(a.point_name) from airport, errmsg = ORA-00904: "GMLPOS"."EXPLATLONG": invalid identifier
Noting that the execution of any other select (without stored procedure) order from python works fine.
Is anybody has a solution or workaround ?
thanks a lot for your help

The result gives what is expected :
AIRP
GMLPOS.EXPLATLONG(A.POINT_NAME)
LFLL
-45.71666666666667 -5.08333333333333
As I said the stored procedure works fine.
Thanks for your expertise
PS : why change the login password until nobody says which machine or database is concerned ?

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