Number allocation when issuing POST call

Hello Everyone,

I have a problem when issuing a API POST call to either the Person or Contact entity. Both entities make use of a so-called number allocation, but I seemingly cannot tap into  this functionality when issuing the call. 

I have tried:

• Not specifying the field in the body that I post, hoping that the (next) number would be allocated automatically. It did not, unfortunately. It left the field blank, even though the settings specifies that the field cannot be blank.
• Specifying the field and its value in the body. I did this by first making a POST call to the GetRefCountEntity agent and getting the current value of the specific RefCountId then adding 1 to that number ("Number2") - the body would look like this (abbreviated):

{
  "Name": "MitTestFirma",
  "OrgNr": "12341234",
  "Number2": 35067,
  "Emails": [
    { ...
etc etc
}

This method is not working either: When I query the GetRefCountEntity agent again after posting, the value has not changed for the specific entity.

Does anyone have a suggestion on how to get this to work - if possible.

Thank you in advance and merry Christmas.

Henrik