Hello,
I am on a Zapier Pro trial and I use the Zapier MCP connector with Claude to automate quotations in Facture.net (app: Facture.net, action: Create Quotation, selected_api FactureNetCLIAPI).
The same action works perfectly in the classic Zap editor: with items_count = 2, the fields description_1, quantity_1, unit_price_1, tax_1 and nature_1 are sent and the quotation is created.
Through Zapier MCP, however, the line-item fields generated by items_count are not exposed by inspect_zapier_actions, and quantity_n, tax_n and nature_n seem to be dropped when the action is executed. Facture.net then always rejects the request with "Quantité doit être rempli" (quantity is required), even when quantity_1, quantity_2 are provided. description_n and unit_price_n are accepted.
Could you expose the dynamic line-item fields (quantity, tax, nature, unit) in Zapier MCP, so that quotations with a variable number of lines can be created? This would let me create quotations with any number of lines, which a Zap cannot do since items_count is fixed at configuration time.
The issue was also reported through the MCP feedback tool on 29 September 2026.
Thank you,
Yannick XXXXX
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