When you use the UPDATE
INFOMAP statement to open an existing information map, the INFOMAPS
procedure creates a working copy of the information map in memory. You
must submit a SAVE statement to save the working copy before you terminate
the INFOMAPS procedure or open a different information map by submitting
an IMPORT, NEW INFOMAP, or UPDATE INFOMAP statement. If you do not
submit a SAVE statement, then any changes that you have made to the
working copy of the information map are lost.