Problem in using procedures in crystal report

Dear All

I am new to Crystal Reports.
I have been trying to use procedure in my crystal report but it is saying “ADO error code 0x80040e14.PLS-00306:wrong number or types of arguments in call to ABC”.On examining further I observed that any procedure having “OUT” parameter could not be added and giving above error.
Moreover it is showing procedures in Database expoert as A.A if procedure name is A i.e. giving double entry for the same procedure.

Can anybody help?

Thanks for your response.