Create a credit invoice
Credits a sales invoice in full or in part, as Crediteren does.
MCP tool snelstart_write → create_credit_invoice
write Confirm
Copies the invoice into a new one with negative amounts, optionally with fewer lines or quantities. Both invoices stay in the overview. Creating a credit invoice needs inStap, and writing off the original in the memorial journal needs inKaart. By default you confirm each call; you can switch that off for this tool.
Parameters
| Name | Type | Description |
|---|---|---|
| invoice_id string required | string | Sales invoice ID from list_sales_invoices or create_sales_invoice. |
| lines array | array | Lines of {article_id, quantity} to credit. Omit to credit the whole invoice. |
| action string | string | One of: send, save_only. Default: save_only. |
tools/call
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "snelstart_write",
"arguments": {
"operation": "create_credit_invoice",
"arguments": {
"invoice_id": "invoice_8c41d2"
}
}
}
}Example response
{
"content": [
{
"type": "text",
"text": "{ ... same JSON as structuredContent ... }"
}
],
"structuredContent": {
"credit_invoice_id": "inv_cr_0007",
"number": "2026-0414",
"credits": "2026-0388",
"amount_total": -919.6,
"status": "saved"
},
"isError": false
}