VMS Help PIPE, Description, Pipelines and TEEs, Image Verification in a Pipeline  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    In a pipeline, image verification is turned off by default, even
    when the command SET VERIFY=IMAGE is executed before the PIPE
    command is entered. This prevents duplication of data records
    going through the pipeline.

    To turn on image verification in a pipeline, an explicit SET
    VERIFY=IMAGE command must precede the pipeline segment command.
    You can use a subshell to do this, as follows:

    $ PIPE ... | (SET VERIFY=IMAGE ; ...)  | ...