With WinSpool/400 Electronic Forms Print Server, you get the error:
The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine the index to permit duplicate entries and try again.
The entry that you have just created is a duplicate.
For example: You can't create two output queue entries that are the same.
Change or delete the entry.