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This error is caused if in the catalog/specimens query, there is no column 'Specimen> Identifier' selected in the result view. In order to rectify the error:
- Go to the catalog/specimens query'Specimens' query (Catalog > Overview > Specimens Query (Link))
- Click on 'Columns' and select the 'Specimen > Identifier'
- Save the query
- Reload the request page and try adding the specimen again.
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