returnLineItemRemoveFromReturn returns error "Return line item has an invalid quantity"

[jakobyte]

Hi guys,

I am trying to remove a item from a return order using the following mutation: returnLineItemRemoveFromReturn

But regardless of the state of the return I keep getting the following error:

        "returnLineItemRemoveFromReturn": {
            "userErrors": [
                {
                    "field": [
                        "returnLineItems",
                        "0",
                        "quantity"
                    ],
                    "message": "Return line item has an invalid quantity."
                }
            ],
            "return": null
        }
    },

While using the following payload:

{
    "query": "mutation ReturnLineItemRemoveFromReturn($returnId: ID!, $returnLineItems: [ReturnLineItemRemoveFromReturnInput!]!) { returnLineItemRemoveFromReturn(returnId: $returnId, returnLineItems: $returnLineItems) { userErrors { field message } return { id status returnLineItems(first: 10) { edges { node { id quantity } } } } } }",
    "variables": {
        "returnId": "gid://shopify/Return/5602443575",
        "returnLineItems": [
            {
                "returnLineItemId": "gid://shopify/ReturnLineItem/8040022327",
                "quantity": 1
            }
        ]
    }
}

And here if you wonder if there is any quantity available on this return:

{
    "returnLineItems": {
        "nodes": [
            {
                "customerNote": null,
                "fulfillmentLineItem": {
                    "id": "gid://shopify/FulfillmentLineItem/13801755738423",
                    "quantity": 1,
                    "lineItem": {
                        "id": "gid://shopify/LineItem/15820551881015",
                        "name": "Revendo Case Everyday iPhone 15 Clear",
                        "sku": "21646",
                        "title": "Revendo Case Everyday iPhone 15 Clear",
                        "quantity": 1,
                        "originalUnitPrice": "29.00"
                    }
                },
                "quantity": 1,
                "refundableQuantity": 1,
                "refundedQuantity": 0,
                "returnReason": "WRONG_ITEM",
                "returnReasonNote": "",
                "id": "gid://shopify/ReturnLineItem/8040022327"
            }
        ]
    }
}

Is this mutation just not working or is there a limitation no one knows about?