BAPI_OBJCL_CREATE

Hello,

I have the following message, please help me

this is my code

   *            "Classification
            CLEAR class.
            class-object = bapi_head-material.
            class-objecttable = 'MARA'.
            class-classnum = 'ZPERU_TIPO_ARTÍCUL'.
            class-classtype = '001'.

            CALL FUNCTION 'BAPI_OBJCL_CREATE'
              EXPORTING
                OBJECTKEYNEW    = class-object
                OBJECTTABLENEW  = class-objecttable
                CLASSNUMNEW     = class-classnum
                CLASSTYPENEW    = class-classtype
                STATUS          =  '1'
                KEYDATE         = SY-DATUM
              TABLES
                RETURN          = returnmessages.