Please check to make sure that you have not included any employment related fields which have no value defined in your API call.
For example, if you wish to update only the NI Number in the ILR for a learner, please only have the NI Number field and value defined.
Below is an example of an API call which will update the NI Number in the ILR for the learner, but will also create a blank employment status record as the “JobTitle” field has been included but does not have a value defined:
{
"niNumber": "AB1234567",
"jobTitle": ""
}