parameter problem with report

I am trying to build a report based on the following query .
I want the user to enter the date value for the R.ANNLAPPT_DATE but when I try to run the query I get the following msg
ORA-00904: invalid column name

The data source for this report is an oracle db

SELECT C.PREFERRED_NAME, C.SURNAME, R.ANNLAPPT_DATE, R.CLNP_CODE, R.CONS_MD_CODE, P.SURNAME AS CLINICIAN, R.DEPT_CODE,
D.DEPT_TITLE, R.PT_CODE, R.REFLREAS_DESC, R.HOSP_CODE, R.REFP_CODE, RP.REFP_TITLE, A.APAT_CODE, MAX(A.APPT_DATE) AS EXPR1,
R.ANNLAPPT_DATE AS EXPR2
FROM ORACARE.K_REFLREG R, ORACARE.K_CPIREG C, ORACARE.K_DEPTLIST D, ORACARE.K_PROFREG P, ORACARE.K_REFPLIST RP,
ORACARE.K_APPTREG A
WHERE R.PT_CODE = C.PT_CODE AND R.DEPT_CODE = D.DEPT_CODE AND R.HOSP_CODE = D.HOSP_CODE AND R.CONS_MD_CODE = P.MPROF_CODE AND
R.REFP_CODE = RP.REFP_CODE AND R.EVENT_NO = A.EVENT_NO (+) AND

(R.ANNLAPPT_DATE < "@.ANNALAPPT_DATE")

GROUP BY C.PREFERRED_NAME, C.SURNAME, R.ANNLAPPT_DATE, R.CLNP_CODE, R.CONS_MD_CODE, P.SURNAME, R.DEPT_CODE, D.DEPT_TITLE,
R.PT_CODE, R.REFLREAS_DESC, R.HOSP_CODE, R.REFP_CODE, RP.REFP_TITLE, A.APAT_CODEI don't think you want to enclose the parameter name in quotes, and if you are using Oracle, you may need to use a ? in place of @.ANNALAPPT_DATE. I think that depends on which driver you are using, though.|||Thanks for the reply,

sql server automaically inserted the double quotes I will try ?.
|||Thanks for the help the ? did the trick.|||

Can you mark the helpful response as an answer?