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                                  • This scenario is that when a document saving to database, need to generate a user friendly unique number with some number rules, its called Document Number.
                                    since v11.2, a Middle-Tier you provided. Generating must completed by Middle-Tier's DataService, that work in same database transaction. because my users don't allow los any number-sequence and must unique by another users. so, how to write some code when DataService persistent objects to database and in same database transaction.

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