Changes the version key tag in a PDF/A document to another version key.
PDF/A is a specialized subset of the PDF specification, also known as "PDF for Archive".
The PDF/A version key identifies the version of the PDF/A standard the document complies with. If the version key is not set correctly, the document is not PDF/A compliant. Note that changing the key does not change the compliance of the document! It will only allow you to continue with your workflow.