Change Data in BPS Layout: Exit Function

Hello everyone,
We are using BW-BPS and we need to make a sort of a certain characteristic in a Planning Folder. In the specific Planning Folder it was defined an exit function and it was assigned a function module.
We implement the following code:
FUNCTION Z_ORDENAR_CLASSIFICACAO_PLANO.
""Interface local:
*" IMPORTING
*"     REFERENCE(I_AREA) TYPE UPC_Y_AREA
*"     REFERENCE(I_PLEVEL) TYPE UPC_Y_PLEVEL
*"     REFERENCE(I_METHOD) TYPE UPC_Y_METHOD
*"     REFERENCE(I_PARAM) TYPE UPC_Y_PARAM
*"     REFERENCE(I_PACKAGE) TYPE UPC_Y_PACKAGE
*"     REFERENCE(IT_EXITP) TYPE UPF_YT_EXITP
*"     REFERENCE(ITO_CHASEL) TYPE UPC_YTO_CHASEL
*"     REFERENCE(ITO_CHA) TYPE UPC_YTO_CHA
*"     REFERENCE(ITO_KYF) TYPE UPC_YTO_KYF
*" EXPORTING
*"     REFERENCE(ET_MESG) TYPE UPC_YT_MESG
*" CHANGING
*"     REFERENCE(XTH_DATA) TYPE HASHED TABLE
DATA:
    lr_area TYPE REF TO cl_sem_planarea_attributes,
    wa_hash_table type ref to data,
    l_sortfield type STRING,
    lr_t_data TYPE REF TO data.
FIELD-SYMBOLS:
    <lt_data> TYPE STANDARD TABLE,
    <ht_head> TYPE ANY TABLE,
    <xth_data> TYPE HASHED TABLE,
    <ls_data> TYPE ANY,
    <wa_data> TYPE ANY,
    <fundo> TYPE ANY,
    <eco> TYPE ANY.
CALL METHOD cl_sem_planarea_attributes=>get_instance
    EXPORTING
      i_area = i_area
    RECEIVING
      er_instance = lr_area.
CREATE DATA wa_hash_table LIKE LINE OF xth_data.
ASSIGN wa_hash_table->* TO <ht_head>.
<ht_head> = xth_data.
LOOP AT <ht_head> ASSIGNING <ls_data>.
This is the characteristic that we pretend to sort
    l_sortfield = 'S_CHAS-0CMMT_ITEM'.
    SORT <ht_head>
      BY (l_sortfield) DESCENDING.
ENDLOOP.
<xth_data> = <ht_head>.
UNASSIGN: <ls_data>, <ht_head>.
ENDFUNCTION.
When execute this function, we get a DUMP (ASSIGN_TYPE_CONFLICT). Does anybody have any suggestion how to change a hash table or somehow make a sort in this hash table?
Thanks in advance.
Ilda

Hi,
After some changes in the code, it seems that xth_data table is assuming the new content. In debugging, we could see that the assignment was made and xth_data records are now in a different order. But when executing the BPS Layout assigned to this planning function, all the lines (records) still in the same place. The Layout doesnt change.
This is the code:
FUNCTION Z_ORDENAR_CLASSIFICACAO_PLANO.
""Interface local:
*" IMPORTING
*"     REFERENCE(I_AREA) TYPE UPC_Y_AREA
*"     REFERENCE(I_PLEVEL) TYPE UPC_Y_PLEVEL
*"     REFERENCE(I_METHOD) TYPE UPC_Y_METHOD
*"     REFERENCE(I_PARAM) TYPE UPC_Y_PARAM
*"     REFERENCE(I_PACKAGE) TYPE UPC_Y_PACKAGE
*"     REFERENCE(IT_EXITP) TYPE UPF_YT_EXITP
*"     REFERENCE(ITO_CHASEL) TYPE UPC_YTO_CHASEL
*"     REFERENCE(ITO_CHA) TYPE UPC_YTO_CHA
*"     REFERENCE(ITO_KYF) TYPE UPC_YTO_KYF
*" EXPORTING
*"     REFERENCE(ET_MESG) TYPE UPC_YT_MESG
*" CHANGING
*"     REFERENCE(XTH_DATA) TYPE HASHED TABLE
DATA:
lr_area TYPE REF TO cl_sem_planarea_attributes,
l_sortfield type STRING,
data_ref TYPE REF TO data,
lr_t_data TYPE REF TO data.
FIELD-SYMBOLS:
<lt_data> TYPE ANY TABLE,
<ls_data> TYPE ANY,
<ls_data_copy> TYPE ANY.
CALL METHOD cl_sem_planarea_attributes=>get_instance
    EXPORTING
      i_area      = i_area
    RECEIVING
      er_instance = lr_area.
CREATE DATA lr_t_data TYPE (lr_area->typename_t_data).
ASSIGN lr_t_data->* TO <lt_data>.
<lt_data> = xth_data.
CLEAR xth_data.
l_sortfield = 'S_CHAS-0CMMT_ITEM'.
SORT <lt_data> BY (l_sortfield) DESCENDING.
MOVE <lt_data> TO xth_data.
ENDFUNCTION.
Does anybody understand this behavior, why the changes in the user-exit are not assumed in the BPS Layout?
Thanks,
Ilda

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