"dm_nested types not supported by this algorithm"
*Cause: The training input to the CREATE_MODEL routine
contains one or more columns of dm_nested type
(DM_NESTED_NUMERICALS and/or DM_NESTED_CATEGORICALS).
These columns are currently not supported for Decision Tree,
O-Cluster, and Adaptive Bayes Network algorithms.
*Action: Remove columns of these data types from the input data source.