The SASEFRED interface engine now does error checking to avoid situations in which the UNITS= option, the OUTPUT= option, and the VINTAGES= option are incompatible. You should be careful when specifying the START= option so that missing values for the start date are avoided when the UNITS= option is not specified as ’lin’. When these options are incompatible, the engine displays a message in the SAS log and sets UNITS=’lin’.