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