split an accounting attribute in two and write two new attributes to MySQL

Hi I'm struggling with an apparently simple task of splitting an accounting stop attribute Acct-Session-Id in two and writing two new values to MySQL In preacct section of default config from sites enabled I added Split-Session-ID = "%{explode:%{Acct-Session-Id} /}" And immediately get error: /etc/freeradius/3.0/sites-enabled/default[558]: Unknown action '%{explode:%{Acct-Session-Id}/}'. Expr module in enabled in mods-enabled expr -> ../mods-available/expr In mysql mapping config I added '{%Split-Session-ID:1}', \ '{%Split-Session-ID:2}', \ As variables to be written to MySQL table. Any help appreciated, Xaled