Whey trying to deploy code with ant migration tool, got the following error on filtered lookup field on custom object

duplicate value found: <unknown> duplicates value on record with id: <unknown> 
  • Are you trying to deploy only one field? <>Object name. Field name<> ? – Ilya Lepesh Jun 22 '16 at 1:38

I think you're trying to overwrite your custom object. Try to deploy only field:

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
| improve this answer | |
  • Uploading a single field is not applicable. I am trying to make legacy code 'deployable' via Continuous Integration. It would be great to understand a reason of this issue – Yury Bondarau Jun 28 '16 at 12:07

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