Modify a value of a field in dynpro, from a User-Exit

Question

Hi guys, i have a problem and i wish you can help me.
In transaction IW32, I am using EXIT_SAPLCOIH_002 to generate a stock transfer order with BAPI_PO_CREATE1. Once this bapi is used, it gives me the number of the document created.
I need to put this number in the field PMSDO-BSTKD (Customer purchase order number) of the dynpro.
First, i tried to modify directly the database (from table pmsdo), but naturally, the dynpro is not updated and when i save the document, it overwrites with a blank value.
Then I tried to use a field symbol directly to the variable of the program of the dynpro, like this:
FIELD-SYMBOLS: <rv_bstkd> TYPE pmsdo-bstkd.
    ASSIGN ('(SAPLCOI3)PMSDO-BSTKD') TO <rv_bstkd>.
    <rv_bstkd> = ls_return-message_v2.
But its has no effect in the screen.
Lastly, i tried to use two FM C14Z_DYNP_WRITE_FIELD and C14Z_DYNP_READ_FIELD
With the "READ" one, I can read the value on the screen. Then with the "WRITE" one, i can write a new value. (that i can, once again, read it, with the new value!). But when I exit the user exit and return to view the screen, the field is still in blank (or with the previous value).
Any, Ideas? I would be grateful for any suggestions.
Thanks in advance.

Answer 1

Hi Jguerra,
Please try FM 'IQS1_FILL_WA_FROM_BUFFER'.
Please see a sample code, am not sure about it, but i just give a try.
data: Lv_VIQMEL like VIQMEL.
CALL FUNCTION 'IQS1_FILL_WA_FROM_BUFFER'
       EXPORTING
            I_QMNUM        = CAUFVD_IMP-QMNUM
            I_AKTYP        = 'V'
       IMPORTING
            E_VIQMEL       = Lv_VIQMEL
       EXCEPTIONS
            NUMBER_INITIAL = 1
            OTHERS         = 2.
check sy-subrc = 0.
if Lv_VIQMEL-MSAUS is initial.
    move 'X' to NO_RELEASE.
endif.
Regards,
Antony Thomas