unicode : comparing uncompatible structs

Hello everyone,

I am a new member on the site and I will post my first question on the forum.

the question is UNICODE, making the transaction UCCHECK I found a mistake in my program, the error is "have the same structure layout as" P_OC ", irrespective of the length of a"

Prog:

FORM creation_enreg_ef18 t_ef18 TABLES it_ef18 STRUCTURE

                                   poste_oc STRUCTURE it_zipsnp

                                   Expedition r_exped STRUCTURE

                                   reception r_recept STRUCTURE

                          LIKE USING date_d p_dt_deb

                                   date_f LIKE p_dt_fin

                          CHANGING STRUCTURE p_oc zreflivrek

                                   p_oc_ref STRUCTURE zreflivrek.

........

     IF IS INITIAL OR p_oc p_oc <> poste_oc. "ERROR"

       CLEAR zreflivrek.

       SELECT SINGLE * FROM zreflivrek

       WHERE werks = werks poste_oc-

       AND zzno_ordre = poste_oc-zzno_ordre.

       p_oc = zreflivrek.

     ENDIF.

do you have any ideas?

Regards