Query compiles..but fails in reporting services

Question

Oracle backend..im very new to it so please bear.
Reporting services (SQL Reporting tool) using an oracle connection.
I wrote a query in toad which seems to compile fine:
CREATE OR REPLACE PROCEDURE RSP_MATERIAL_PLANNING
     IN_SUBJECT IN varchar2 :=NULL,
     IN_AUTHOR IN varchar2 :=NULL,
     IN_PROJECTNAME IN varchar2 :=NULL,
     IN_WBS varchar2 :=NULL,
     IN_STARTDATE date :=NULL,
     IN_ENDDATE date :=NULL,
     p_cursor out types.sqlcur
AS
BEGIN
open p_cursor for
SELECT 
         MAX(PROJ_TASK.PROJECTNAME) AS PROJECTNAME,
          PROJ_TASK.TEXT_29,
          CASE WHEN PROJ_TASK.TEXT_29='SAP' OR PROJ_TASK.TEXT_29='CMS-SHIP' THEN MAX(PROJ_TASK.MILESTONE_DATE) ELSE MAX(PROJ_TASK.EXPECTED_START_DATE) END AS ESD1,
          PROJ_TASK.TEXT_26,
          MAX(PROJ_TASK.TEXT_27) AS WBSDescription,
          MAX(PROJ_TASK.EXPECTED_START_DATE)  AS ESD,
          MAX(PROJ_TASK.MILESTONE_DATE) AS MD
FROM    PROJ_TASK
INNER JOIN
                PROJECT ON PROJECT.PROJECTID = PROJ_TASK.PROJECTID
WHERE  
          (PROJ_TASK.EXPECTED_START_DATE BETWEEN IN_STARTDATE AND IN_ENDDATE OR IN_STARTDATE IS NULL)
          AND (PROJECT.SUBJECT = IN_SUBJECT OR IN_SUBJECT IS NULL OR IN_SUBJECT='All')
          AND (PROJECT.AUTHOR = IN_AUTHOR OR IN_AUTHOR IS NULL OR IN_AUTHOR='All')
          AND (PROJECT.PROJECTNAME = IN_PROJECTNAME OR IN_PROJECTNAME IS NULL OR IN_PROJECTNAME='All')
          AND (PROJ_TASK.TEXT_26 = IN_WBS OR IN_WBS IS NULL OR IN_WBS='All')
          AND (PROJECT.PROJECT_TYPE=2)
          AND (PROJECT.CATEGORY <> 'SERVICE')
          AND (PROJ_TASK.TASK_TYPE = 0)
          AND (PROJ_TASK.TEXT_29 = 'BOM-M' OR PROJ_TASK.TEXT_29 = 'BOM-E' OR PROJ_TASK.TEXT_29 = 'BOM-F' OR PROJ_TASK.TEXT_29 = 'MATF'  OR PROJ_TASK.TEXT_29 = 'SAP'  OR PROJ_TASK.TEXT_29 = 'CMS-SHIP')
GROUP BY
            PROJ_TASK.TEXT_26, PROJ_TASK.TEXT_29
ORDER BY
          PROJECT.SUBJECT, PROJECT.AUTHOR, PROJECT.PROJECTNAME, PROJ_TASK.TEXT_26;
END;
/But when I execute my report in reporting services I get:
Microsoft Development Environment
An error occurred while executing the query.
ORA-00979: not a GROUP BY expression
ORA-06512: at "CONCERTO.RSP_MATERIAL_PLANNING", line 13
ORA-06512: at line 1
OK  
---------------------------As soon as I Comment OUT the group by clause it works fine...so what is wrong with my query ?
Thanks,
Jon

Answer 1

Very strange...I had to also comment out the fields that do not contain aggregate functions such as MAX() to get this to work...
Basically I need to convert the following SQL SERVER stored procedure:
--ver 1.2
CREATE PROCEDURE rsp_material_planning
                                             @SUBJECT varchar(255)=NULL,     
                                             @AUTHOR varchar(255)=NULL,
                                             @PROJECTNAME varchar(255)=NULL,
                                             @TEXT_26 varchar(255) = NULL,
                                             @StartDate datetime=NULL,
                                             @EndDate datetime = NULL
AS
SET NOCOUNT ON
SELECT       MAX(pt.PROJECTNAME) AS PROJECTNAME,
          pt.TEXT_29,
          pt.TEXT_26, MAX(pt.TEXT_27) AS WBSDescription,
          MAX(pt.EXPECTED_START_DATE)  AS ESD,
          MAX(pt.MILESTONE_DATE) AS MD
     INTO #p2 FROM PROJ_TASK pt INNER JOIN PROJECT p ON
          p.PROJECTID=pt.PROJECTID
     WHERE
          (pt.EXPECTED_START_DATE BETWEEN isnull(DATEADD(d, DATEDIFF(d, 0, @StartDate), 0), '19000101') AND isnull(DATEADD(d, DATEDIFF(d, 0, @EndDate), 0), '99990101'))
          AND
           (@SUBJECT IS NULL OR p.SUBJECT = @SUBJECT) AND
           (@AUTHOR IS NULL OR p.AUTHOR = @AUTHOR)
          AND (@PROJECTNAME IS NULL OR pt.PROJECTNAME=@PROJECTNAME)
          AND
          (pt.TEXT_26 = @TEXT_26 OR @TEXT_26 IS NULL)
          AND p.PROJECT_TYPE = 2
          AND pt.TASK_TYPE=0
          AND
          (pt.TEXT_29='BOM-M' AND pt.TASK_STATUS <> 2 AND p.CATEGORY <> 'SERVICE')
          OR (pt.TEXT_29='BOM-E' AND pt.TASK_STATUS <> 2 AND p.CATEGORY <> 'SERVICE')
          OR (pt.TEXT_29='BOM-F' AND pt.TASK_STATUS <> 2 AND p.CATEGORY <> 'SERVICE')
          OR (pt.TEXT_29='MATF' AND pt.TASK_STATUS <> 2 AND p.CATEGORY <> 'SERVICE')
          OR (pt.TEXT_29='SAP' AND pt.TASK_STATUS <> 2 AND p.CATEGORY <> 'SERVICE')
          OR (pt.TEXT_29='CMS-SHIP' AND pt.TASK_STATUS <> 2  AND p.CATEGORY <> 'SERVICE'))
     GROUP BY  TEXT_26, pt.TEXT_29
     ORDER BY PROJECTNAME, TEXT_26, pt.TEXT_29
SELECT PROJECTNAME, TEXT_29, TEXT_26, WBSDescription,
CASE WHEN TEXT_29 = 'SAP' OR TEXT_29='CMS-SHIP'  THEN MD else ESD END AS ESD1
FROM #p2
ORDER BY
     CASE
          WHEN TEXT_29 = 'BOM-M' THEN 'a'
          WHEN TEXT_29 = 'BOM-E' THEN 'b'
          WHEN TEXT_29 = 'BOM-F' THEN 'c'
          WHEN TEXT_29 = 'MATF' THEN 'd'
          WHEN TEXT_29 = 'SAP' THEN 'e'
          WHEN TEXT_29 = 'CMS-SHIP' THEN 'f'
     END,  PROJECTNAME, TEXT_26
drop table #p2
Set NOCOUNT OFF
GOInto an oracle stored procedure...which I thought I had in my initial response...the difference is in the sql server one I use a temp table p2 to store the data...Does oracle have any similiar syntax or can anyone help me convert the above to work for oracle ?
Thanks,
Jon