When Two person print at on time,error happened.

Question

Hello:
   The code:  (S_NUMBER is sequence number)
   SELECT
    FROM <table>
    INTO TABLE ITAB
    SORT ITAB BY ZNUMBER.
    LOOP AT ITAB.
        S_NUMBER = ITAB-ZNUMBER.
    ENDLOOP.
    WA-ZNUMBER = S_NUMBER + 1.
    WA-ZNAME = NAME.
    WA-ZUSER_ID = ID.
    CONCATENATE SY-DATUM SY-UZEIT INTO PTIME.
    WA-ZTIME = PTIME.
    INSERT INTO <table> VALUES WA.
   When two person print different documents at one time.the printer work automatic,but S_NUMBER is same,and can not insert the wa into the table.
Hope someone can give me some helps.
Regards&Thanks
zagory

Answer 1

Hi zagory,
In your program you may need to lock your table when you update the record and unlock it back so that the database entries remain consistent.
See http://help.sap.com/saphelp_nw04/helpdata/en/41/7af4c8a79e11d1950f0000e82de14a/content.htm for SAP Locking example.
Regards,
Wenceslaus.