File Browse Validation not stopping upload

Hi Guys,
I am using Apex 4.0 and need help with the following please:
I have a file browse item which uploads a file into the built in WWV_FLOW_FILES. The problem is it uploads even when there is an error and my validation flags up.
Is it supposed to, does anyone no a work around? Basically I dont want the end user to upload the same file more than once.
Thanks in advance all
Spam

I have a file browse item which uploads a file into the built in WWV_FLOW_FILES. The problem is it uploads even when there is an error and my validation flags up. Is it supposed to...Yes. The file data is just the same as any other form value, and has to be submitted and held in session state (in this case in <tt>APEX_APPLICATION_FILES</tt>) before APEX can do anything with it:
{thread:id=902770}
Basically I dont want the end user to upload the same file more than once.You'll have to perform some kind of validation check for this and if it fails, delete the unwanted file:
{thread:id=1772863}

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