This CREATE SYNONYM statement names another synonym. Making a chain of synonyms is not supported. See the discussion of error -218 for a way to list the names of all synonyms. To have a second synonym with the same meaning as the first, find out the meaning of the other synonym. Then make a new synonym to refer to the same base table. To see the base table for a given synonym, query systables and syssyntable as follows, substituting the name of the synonym:
SELECT T.tabname synonym, S.* FROM systables T, syssyntable S WHERE T.tabname = name AND T.tabid = S.tabid
If btabid is defined in the resulting display, the synonym refers to a table in that current database with that tabid; otherwise, it refers to an external database.