Argentina Updates Electronic Export Invoice
Web Service: New Validation Rules

Argentina’s tax authority introduced new validation rules for the Electronic Export Invoice web service (WSFEXV1) through regulation R.G. N° 2.758 on August 10, 2025. The mandatory change was implemented with version 3.1.0 of the developer’s manual and affects the B2B electronic export invoicing process.

Technical updates have been made to Argentina’s electronic invoicing system. The new regulation published by the tax authority introduces additional control mechanisms for processing export documents via web services.

Two New Validations in FEXGetLast_CMP Method

The update adds two new input validations to the FEXGetLast_CMP method, which queries the last authorized document number for a specific document type and point of sale:

Cbte_Tipo (Document Type) Validation:

• Value must be one of the enabled types (19, 20, or 21)
• If an invalid type is sent, the system will return error code 1606

Pto_venta (Point of Sale) Validation:

• Value must be valid and registered for ‘Export Receipts – Web Services’
• If an invalid value is sent, the system will return error code 1607

Companies with systems integrated with this web service may need to adapt their processes to handle these new validations and potential error codes to ensure correct authorization of export documents.

Source: Argentina Tax Authority – R.G. N° 2.758, August 10, 2025

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