Duplicate message in CRM web UI

Hi Experts,

I am getting duplicate messages in CRM web ui.

If we have given one error message .1st time it comes as information then warning.

I have one exit where i have put some custom error messages for CRM web ui.

EXIT_SAPLSZAR_001

In Side this exit we are calling perform for standard CRM web ui message.

*  perform check_delivery_address(SAPLSZAR) TABLES   error_table

*                                              USING X_ADRC_STRUC

*                                              CHANGING delivery_fields

*                                                        del_city_flag

*                                                        del_strt_flag

*                                                        y_retcode.

Please have a look into it & help me.

Thanks

Roli