Is it possible to save a file opened as 'non-GLP' as a signed GLP file?

At any time that a file is opened as a 'non-GLP' file, any previous GLP status will be annulled.  This is flagged up by the status lights in the top left of the LabChart view where the GLP status is shown. 
servlet.ImageServer?id=015w0000002Otvg&oid=00D20000000HncM
Whilst it is possible to save a signed file where you have opened a non GLP file and made modifications, it will show in the Audit trail that a non-GLP file was opened and still the status will not revert back from Non-GLP document.  Only files that have been open, saved, reopened and re-signed as GLP files will have the GLP Document status in the file.
servlet.ImageServer?id=015w0000002Otvq&oid=00D20000000HncM