Approve purchase order with Odata

[dean98]

Hi,

I have an issue to approve a purchase order with Odata. I have a custom button that activates the PurchaseOrderApprove action. After pressing the button from the UI I am getting a 200 OK response and value "true" for "PurchaseOrderApprove" but nothing is happening inside the purchase order. But, when I am using postman to approve the same purchase order I am getting the same response, and the approval process changes.

What am I doing wrong?