Deletion of Master data failed although there is data

Dear all,

It try to delete Master data with this Function call:

CALL FUNCTION 'RSDMDD_DELETE_MASTER_DATA'
   EXPORTING
     i_iobjnm                  = 'HRCHZBDAT'
 *   I_T_CHAVL                 =
    i_flag_delete_all         = rs_c_true
    i_flag_delete_sids        = rs_c_true
    i_flag_dialog             = rs_c_false
 *   I_FLAG_DELETE_TEXTS       = RS_C_TRUE
 *   I_FLAG_FORCE_DELETE       = RS_C_FALSE
 *   I_FLAG_SIMULATION         = RS_C_FALSE
    i_flag_log                = rs_c_false
    i_usage_protocol          = rs_c_false
 *   I_SEARCH_MODE             = 'O'
 *   I_T_EXPR                  =
 *   I_STORAGE_SELECTION       = '*'
 * IMPORTING
 *   E_PROT_OBJECT             =
 *   E_PROT_SUBOBJECT          =
 *   E_PROT_EXTNUM             =
 *   E_T_MSG                   =
 *   E_T_VALSID_USED           =
 *   E_RESULT                  =
           .
 
   CALL FUNCTION 'DB_COMMIT'.

But after running of that function I get the result that there is no master data to delete. I get the same info if I try to click right mouse button on the info object in RSA1 and then delete master data. But if I go to this info object in RSD1 I find data in the P-table and I see it in the maintain dialog (Internet explorer). I can select a row in this dialog and delete the row but why don't this work with this function or with the right mouse button?

Thanks!