Salesforce offers a functionality that detects duplicate records based on Matching rules. When a duplicated record is detected, there are two possible actions for both create & edit:
-Allow
-Block
When the form is submitted, the 123FormBuilder app tries to create/edit a record but Salesforce checks the Duplicate rules and if the selected action is Block, then no new record is created, nor existing record is updated.
If the selected action in the Duplicate rule is to Allow and Show an Alert, when manually creating/updating a record in Salesforce – a prompt will show up with the Alert text and one can interact with that prompt. However, via API, no such interaction is available and 123FormBuilder app will fail to create/update the record, with the Alert text as a failed message.
To avoid this behavior and make sure that upon submission the record will be created/updated when the Allow action is selected in the duplicate rule, you can enable the option Override Duplicate Rules when creating/updating record from the mapping interface, under Record Preferences:
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