I created GET and POST requests. And now I am trying to use PATCH request to update the purchase invoice data via Postman and getting the following error :
{
"error": {
"code": "BadRequest_InvalidToken",
"message": "Could not validate the client concurrency token required by the service. Please provide a valid token in the client request. CorrelationId: f680dd3c-3b23-4bd4-b4a0-f650dba743c5."
}
}
Body (raw, JSON):

PATCH request line:
api.businesscentral.dynamics.com/.../purchaseOrders({id})
I do not understand what I am doing wrong.
Any Idea?