updateRecords is not updating

updateRecords is not updating the data. When I do POST to the API to updateRecords, I recieve the correct xml with "Record(s) updated successfully". Then I come back to the Dashboard and I can see my event in the logs, but when I open the candidate details the data is intact with no changes. Am I doing something wrong? I call to https://recruit.zoho.com/ats/private/json/Candidates/updateRecords, with my authtoken, the scope, id and xmlData parameters. The xmlData is like this... 22222 Any idea? Thank you.