Map rules are used in output cards of a map to define how output data is built. Map rules are required for output data generation. If there is no map rule, there is no output data. When no output is desired for a given data object, a map rule of =NONE is required.Map rules are used in output cards of a map to define how output data is built. Map rules are required for output data generation. If there is no map rule, there is no output data. When no output is desired for a given data object, a map rule of =NONE is required.Map rules are used in output cards of a map to define how output data is built. Map rules are required for output data generation. If there is no map rule, there is no output data. When no output is desired for a given data object, a map rule of =NONE is required.Map rules are used in output cards of a map to define how output data is built. Map rules are required for output data generation. If there is no map rule, there is no output data. When no output is desired for a given data object, a map rule of =NONE is required.Map rules are used in output cards of a map to define how output data is built. Map rules are required for output data generation. If there is no map rule, there is no output data. When no output is desired for a given data object, a map rule of =NONE is required.