Error when creating CustomerCreditNote

[skalholm]

Hi,

Has there been any changes regarding CustomerCreditNotes?
We have been creating customer credit notes through POST 

controller/api/v2/customerCreditNote

for atleast a year.

We are now experiencing issues where we always get an error response:
For Invoice type CRM with invoice number , you cannot update origInvoiceDate. The field is disabled.

even though we do not send origInvoiceDate.