If you are using the updated RPG demonstration schema LongRangeDemo make sure that the library list of the user you are using has library LRNG_PROJ in the library list.
Also make sure that it does not contain some other library containing your older version(s) of program EZISERVICE.
Otherwise the new demonstration RPG programs may call your old EZISERVICE program version and fail.
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The reverse also applies – in your existing apps you would never have library LRNG_PROJ in your library list.
This means your current EZISERVICE version (in your own library) is unchanged and will continue to work exactly as it did before.
If you want to upgrade your existing applications to use the new EZISERVICE program, then copy the programs and source code from the new LRNG_PROJ library into your library, replacing the EZI components already there. Then to be safe recompile your programs to pick up all the new EZI definitions.