automatic/autonomous refresh of materialized views does not work

configuring a materialized view (snapshot) to be automatically refreshed/reloaded does not happen, even with option "teiid_rel:ALLOW_MATVIEW_MANAGEMENT" true.

(see forum reference for full vdb details)

server log reports:
WARN [org.teiid.PROCESSOR] (Worker110_QueryProcessorQueue3121) KbqgRXX20t5r TEIID30020 Processing exception for request KbqgRXX20t5r.0 'TEIID31100 Parsing error: Encountered "[*]SYSADMIN.refreshMatView[*](\"views\".\"dati_mat\"" at line 1, column 1.
Was expecting: "alter" | "begin" | "call" | "create" | "delete" | "drop" | "exec" | "execute" | "insert" | "merge" ...'. Originally QueryParserException QueryParser.java:214. Enable more detailed logging to see the entire stacktrace.

since the view has a ttl of 120000 the above log appears every two minutes.