Unlike SAS data sets, CAS tables do not store the data type information, which is critical for procedures to properly process input data sets of special data types. See Appendix A, Special SAS Data Sets, for more information about special data sets.
You must use the TYPE= option to specify the data type of an input CAS table when it is not an ordinary raw data set. For example, DATA=myCAS.covmat(TYPE=CORR) specifies that the CAS table named covmat contains correlations as data. Other examples of special data types that you must specify explicitly for input CAS tables include TYPE=ACE, COV, DISTANCE, EST, LINEAR, TREE, and so on.