Three ASN.1 types allow the application program to include different pieces of information, even after the ASN.1 definition is complete. They allow the application program to determine, at execution time, what information should fall within certain fields. VTAM® CMIP services calls these types decision types, and they include CHOICE, ANY and ANY DEFINED BY.

Note that the hexadecimal BER format is not supported for CHOICE and ANY DEFINED BY types. If the application program needs to specify the latter as BER, the entire SEQUENCE that contains the ANY DEFINED BY must be specified as a single BER value.