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Several Interactive Reports in one ExtJS page

Von Tobias Arnhold 6.11.2009
I created an example page for the ExtJS layout http://apex.oracle.com/pls/otn/f?p=65555 based on the solution of Roel Hartman "Using two Interactive Reports on one page"
Just follow the tree link: "Integrate IRs into one ExtJS page"

I encountered a problem when I accessed the example page with IE8. After the first page load the following error could occur:
ORA-00001: unique constraint
After another reload the error disappears and the application works fine.