Library /sys$common/syshlp/nclhelp.hlb set, osi_transport, template, expedited_data  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: True          Value: True or false

    Specifies whether use of the expedited data option should be
    negotiated for the transport connections. This attribute is not
    valid for protocol class 0.

    set  [node node-id] osi transport template template-id -
         expedited data boolean

    Example:

    set osi transport template osit$loop_clns -
         expedited data true