Shopware 6 Order line item update API

Hello Everybody,

Can anybody help me on Update existing order’s Product quantity through shopware 6 API.
I tried with end point  /api/v{version}/_action/order/{orderId}/lineItem.  It’s returning the 204 status. But once save the order its returning following error
 

{
  „errors“: [
    {
      „status“: „400“,
      „code“: „CHECKOUT__CART_EMPTY“,
      „title“: „Bad Request“,
      „detail“: „Cart is empty“,
      „meta“: {
        „parameters“: [
          
        ]
      }
    }
  ]
}

Hi, have you found a solution?
I am having a similiar problem.

I have the same problem. How did you solved?