PDF14 Running headers and footers

The PDF checker at http://checkers.eiii.eu/en/pdfcheck/ often returns the following result:

Fail: running headers and footers. Running headers and footers are not provided or running headers and footers provided are inconsistent with the section headers.

However, PDF14 is only an advisory technique for 3.2.3.

Therefore I wonder what the importance of this technique is for PDF files. Do running headers and footers always have to be present? And is it a problem if some text in the header/footer is marked as an artifact in InDesign but not as a header/footer (assuming the important information in this text is also added to the main text on the front page).

Thanks for any insights.

Michèlle
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