The customer form from [parts 1-3] does CRUD, validates, searches, warns about duplicates and has a tested service behind it. The next item on the list was the one you cannot retrofit cheaply later: Two people open the same customer. Both edit.

Source: [Dev.to](https://dev.to/f345345dfg/a-customer-maintenance-form-in-uniface-10-part-4-the-platform-already-had-optimistic-locking-i-2dfl)

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