How to give error messages in odata services

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How to give an error message in OData services, I going to write simple code so we can achieve error in OData service here I write simple code can help you to give an error message in data 

method ZODATAERRORSET_GET_ENTITYSET.
   Data: ls_header             TYPE ihttpnvp.
*      ls_header-name  = 'ERROR'.
*         /iwbep/if_mgw_conv_srv_runtime~set_header( ls_header ).

        ls_header-name  = 'ERROR'.
        ls_header-value = 'Sales order creation problems'.
        /iwbep/if_mgw_conv_srv_runtime~set_header( ls_header ).

endmethod.
 

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