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Level 2

In Designer go to File -> Form Properties and choose the defaults tab.  Change the Target Version of the from from Acrobat 8 and later to Acrobat 9 and later.

Once this is change the XFA version of the form has been updated.  If you still have issues then, you may also need to go the XML Source view near the end of text you may see an element similar to this, the version number may be different.  You can remove this line

 

<?originalXFAVersion http://www.xfa.org/schema/xfa-template/2.6/?>

Once you move back to the Design View you will be prompted to save.