{-# STDLIB_VERSION 6 #-}
                {-# CONTENT_TYPE DAPP #-}
                {-# SCRIPT_TYPE ACCOUNT #-}
                let COUNTER = "totale_iscritti"
                @Callable(i)
                func registraImpresa(ragioneSociale: String, provincia: String, cfv: String, did: String) = {
                let caller = toString(i.caller)
                let n = match getInteger(this, COUNTER) { case a: Int => a case _ => 0 }
                if (isDefined(getString(this, "cfv_" + cfv))) then throw("CFVS già registrato")
                else [
                IntegerEntry(COUNTER, n + 1),
                StringEntry("cfv_" + cfv, did),
                StringEntry(cfv + "_data", ragioneSociale),
                StringEntry(cfv + "_owner", caller),
                IntegerEntry(cfv + "_ts", lastBlock.timestamp)
                ]
            }