"Current tabular form data is too old"  on apex 4.2

jmarc
    hello,

    we have install apex 4.2(embedded pl/sql gateway) on an oracle database 11.2.0.2(windows 2008 server) .


    we create a tabular form and validations on it .

    when a validation fail on tabular form, we have the error :

    Current tabular form data is too old; the source data has been modified.
    Click here to discard your changes and reload the data from the database.


    so, i try to reproduce with the "sample tabular form" .

    i install the sample ,
    i run the sample and choose the tab "Employees".
    I click on the button "add a row",enter a name "DUPONT" and choose to "apply changes" .

    so i have the 3 errors validation
    3 errors have occurred
    •Job must have a value. (Row 11)
    •Hiredate must have a value. (Row 11)
    •Department must have a value. (Row 11)


    these 3 errors are expected,

    but also
    the error
    Current tabular form data is too old; the source data has been modified.
    Click here to discard your changes and reload the data from the database.

    i try with different internet browsers(firefox, IE, google chrome) but the error always occurs .


    i try to reproduce on apex.oracle.com with no success.



    regards
    jm