Can I create Quotes without specifying UnitAmount - xero-api

Question

We are generating Quotes from our application using Xero API. We have created our Line Item in Poducts and Services and added price there.
From the API, we do not wish to send Price again, as this is already in Xero. We wish to send LineItem code and perhaps account (Sell vs Purchase) and let Xero use the price.
Can anyone let us know if there is a way to accomplish this, without having to query Xero for the Products and Services prices to build the Quote?
Thank you for your help.
Request:
{
  "Quotes": [
    {
      "Contact": {
        "ContactID": "a852a44c-3d8f-4c4b-a628-3a2c2121b9b1"
      },
      "LineItems": [
        {
          "ItemCode": "BOOK",
          "Description": "BlaBla",
          "Quantity": 1
        }
      ],
      "Date": "2022-12-20",
      "Reference": "Event Name"
    }
  ]
}
Response (error 400):
{
"ErrorNumber": 10,
"Type": "ValidationException",
"Message": "A validation exception occurred",
"Elements": [
{
"Reference": "Event Name",
"Contact": {
"ContactID": "a852a44c-3d8f-4c4b-a628-3a2c2121b9b1"
},
"LineItems": [
{
"Description": "BlaBla",
"ItemCode": "BOOK",
"Quantity": 1.0
}
],
"Date": "\/Date(1671494400000)\/",
"ValidationErrors": [
{
"Message": "Unit Amount cannot be empty"
}
]
}
]
}