A user-created dictionary contains any alphanumeric entries and related DBCS words that you choose to include. You might create a user dictionary to contain words unique to your business or words that you use regularly but that are not included in the server-supplied dictionary.
You can create one or more DBCS conversion dictionaries with any name and store them in any library. When performing DBCS conversion, however, the server only refers to the first user dictionary named QUSRIGCDCT in the user's library list, no matter how many dictionaries you have or what they are named. Make sure that the library list is properly specified so that the server checks the correct dictionary.
During DBCS conversion, the server checks QUSRIGCDCT before checking QSYSIGCDCT.