Symptoms

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Record Producer creating blank record.

Release

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London Patch 4 Hot Fix 2

Cause

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Using a deprecated widget in the Service portal causing an issue with variable mapping.

Resolution

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> Navigate to the service portal ex: /sp
> Open the Record Producer and verify the widget on the instance.
(hold cntrl on your keyboard and click on the Record Producer form will display the name of the widget).
> Make sure the widget is OOTB 
or
> If it is a custom widget, verify that it was built using an OOTB valid "SC Catalog Item" widget.
>There is a "SC Catalog Item Deprecated" widget which has been deprecated after Jakarta.
> If the instance is upgraded to a latest version after Jakarta, the custom widget might cause issues.

So, if your service portal widget is build using this deprecated widget,make sure to apply the customization over the valid "SC Catalog Item" widget.