Validation Error from OpenElis on some lab tests

In one of our implementation, we are using OpenElis for lab tests and OpenMRS for the clinical part. On some random occasions, results appear with a validation error and hence cannot sync back to OpenMRS We have not been able to recreate the issue as this happens randomly and can occur on any test. Has any one been in the same situation? Please find below a screenshot of the error.


Could anyone have a feedback on the above?