Symptoms
An error appears in the troubleshooting section with the category ‘Multi to Single Asset Error' and a message containing, e.g. “Validation failed for insight object“.
Cause
You can sync from multi to a single text field. However, if you add multi values to a multi select field an error will be thrown as Backbone doesn’t know which one to pick on Jira Cloud.
Resolution
Check the configuration, and update one of the following:
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The values of the multi object field and change it to only one value
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Change the multi object field to a single object field
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Change the single object field to a multi object field
After, you can perform a resync for the work item affected.