Problem with Temp Table and Result Set from PL Function...

When I run following Function with the following SETOF table...

it says:

NOTICE:  table "temp_production_product_operations" does not exist, skipping
CONTEXT:  SQL statement "drop table if exists 
temp_production_product_operations "
PL/pgSQL function "pb_report_temp_gerceklesme12" line 11 at execute 
statement

ERROR: set-valued function called in context that cannot accept a set
SQL state: 0A000
Context: PL/pgSQL function "pb_report_temp_gerceklesme12" line 56 at return 
next

Where is the error? I could not determined...



CREATE TABLE temp_temp_production_operations
( product_code character varying(25), product_name character varying(255), production_order bigint, stock_code character varying(25), operation_code bigint
) ;


===================================================
DROP FUNCTION pb_report_temp_gerceklesme12 ( character varying, character 
varying);

CREATE OR REPLACE FUNCTION pb_report_temp_gerceklesme12(character varying, 
character varying) RETURNS SETOF temp_temp_production_operations AS
$BODY$

DECLARE
tmp RECORD;
var_stock_code ALIAS FOR $1;
var_production_order ALIAS FOR $2 ;

BEGIN

-- drop temp table, if it exists (ignore exception if it doesn't) begin   execute 'drop table if exists temp_production_product_operations ' ;
   exception   when undefined_table then     null; -- do nothing end;


  EXECUTE 'create temp table temp_production_product_operations AS '|| ' SELECT stk.stock_code AS product_code, stk.stock_name AS product_name,  '|| ' NULL::integer AS production_order, pot.stock_code, pot.operation_code  
'|| ' FROM stock stk, production_operations_template pot  '|| ' WHERE stk.stock_code =  '|| '''' || var_stock_code || ''''|| ' AND stk.stock_code =      '|| ' CASE  '|| ' WHEN (( SELECT ds.production_order  '|| '  FROM production_operations_details ds '|| '  WHERE ds.product_code = stk.stock_code AND ds.production_order = '|| '''' || var_production_order || ''''|| '  LIMIT 1)) IS NULL THEN pot.product_code  '|| '    ELSE ''''::varchar  '|| ' END  '|| ' UNION '|| '  SELECT stk.stock_code AS product_code, stk.stock_name AS 
product_name,   '|| ' pot.production_order, pot.stock_code, pot.operation_code '|| ' 	 FROM stock stk, production_operations_details pot  '|| ' 	 WHERE stk.stock_code = '|| '''' || var_stock_code || ''''|| '  AND stk.stock_code =  '|| '  CASE  '|| '   WHEN (( SELECT ds.production_order  '|| '        FROM production_operations_details ds  '|| '   WHERE ds.product_code = stk.stock_code AND '|| '  ds.production_order =  '|| '''' || var_production_order || ''''|| ' LIMIT 1)) IS NOT NULL  '|| '   THEN pot.product_code   '|| '   ELSE ''''::varchar   '|| '    END  ORDER BY 1, 2, 4 ';
 -- temp_production_product_operations : WE created as temp above... FOR tmp IN EXECUTE 'SELECT * FROM temp_production_product_operations'   LOOP    RETURN NEXT tmp;   END LOOP;


RETURN;

end;
$BODY$ LANGUAGE 'plpgsql';
===============================================

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