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The method checks whether an exchange rate volatility exists.
The object that is to be read for this purpose is identified by the following parameters: MDCODE, VOLTYPE, FROMCCY, TOCCY and VALIDDATE. If the volatility is an implied volatility, the option, which was calculated using the implied volatility, can be specified as well (parameters EXTNOOPTION, EXTPRODTYPEOPTION).
The result is returned in parameter EXISTS. If errors occur when the object is read, the module writes error messages to message table "Return".