BMSCH1004W Warning filename may already be open. Read only access acquired
The painter could not obtain read/write access to the source file. It may be open in another process or the file may be marked
as read only.
Resolution:
You can still edit a mapset that has read-only access. Selecting "Save" for a read-only file results in a "Save As" dialog
that lets you save the file with a different filename.