An element embedded or referenced in the xHTML document of an ESEF report is not allowed to contain executable code (such as JavaScript, VB script, Shockwave, Flash) or references (such as hyperlinks) pointing outside the reporting package.
If the contents of the reporting package is in violation with the above, you will see one or two error messages: Violation: “Executable code present” or Violation: “References pointing outside of the reporting package present”.