How can i back to Text Item ???

i have TextItem
. in Post_Item Trigger i am Checking the value in Text Item
With Value in DataBase and Get Other Data Related by this value into another Text Item.
if value not Found in dataBase how can i came back to Text_item to change the value .
like text item contain code and return Name into another TextItem
if code not found do not leave TextItem.

First of all, do NOT do validation like that in a post-text-item trigger. You are needlessly running validation every time the user tabs through the field.
You should be putting validation ONLY in a when-validate-item or when-validate-record trigger. They only run if the value has been changed.
And any time you issue an error message, it must always be followed by RAISE FORM_TRIGGER_FAILURE;

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    Windows Vista: \Users\username\My Music\
    Windows 7 or 8: \Users\username\Music\
    Open iTunes while holding down the Option key (Mac) or Shift key (Windows).
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    Select the iTunes folder you just moved to the internal hard drive.
    Click Choose (Mac OS X) or Open (Windows) and then choose the iTunes Library file inside .
    After following these steps, iTunes will open and your iTunes Library will be restored.
    (http://support.apple.com/kb/ht1751)

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    https://discussions.apple.com/docs/DOC-3141
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