Landed Cost Voucher via API

ERPNext
1

I’m importing data from our previous system into ErpNext via API and I’ve gotten to landed cost vouchers. This one is giving me a perplexing error messge:

“Item must be added using ‘Get Items from Purchase Receipts’ button”

This seems to imply creating a LCV from API is impossible as it requires a UI interaction?

I’m trying a POST at this endpoint: /api/resource/Landed Cost Voucher

With the example body:

{
  "posting_date": "2024-12-11",
  "company": "Company",
  "distribute_charges_based_on": "Amount",
  "custom_mv_number": "TSH 1745",
  "custom_sb_id": 535,
  "custom_mv_id": 16754,
  "custom_mv_status": "Closed",
  "custom_sb_supplier_id": "1104",
  "custom_payment_method": "None",
  "purchase_receipts": [
    {
      "receipt_document_type": "Purchase Receipt",
      "receipt_document": "MAT-PRE-2025-01765"
    }
  ],
  "items": [
    {
      "receipt_document_type": "Purchase Receipt",
      "purchase_receipt": "MAT-PRE-2025-01765",
      "item_code": "Q-2231"
    },
    {
      "receipt_document_type": "Purchase Receipt",
      "purchase_receipt": "MAT-PRE-2025-01765",
      "item_code": "Q-2222"
    }
  ],
  "applicable_charges": [
    {
      "expense_account": "Expenses Included In Valuation - SGS",
      "description": "Tariff - Tariff fee ",
      "amount": 32.33
    },
    {
      "expense_account": "Expenses Included In Valuation - SGS",
      "description": "Shipping-D - Shipping (Domestic)",
      "amount": 6.99
    }
  ]
}

These are all pointing to specific other documents that already exist. Is there any workaround to programmatically create these without having to push a physical button for each one?