ERPNext Country Specific Functionality for Mauritius (CSF MU)

Overview

CSF MU adds Mauritius Revenue Authority (MRA) e‑invoicing support to ERPNext. It introduces the required settings, custom fields, validations, tax code mapping, invoice transmission, and logging.

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Install

bench --site <your.site> install-app csf_mu
bench --site <your.site> migrate
bench --site <your.site> clear-cache

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Core Setup

1. CSF MU Settings

Go to CSF MU Settings and fill:

• Auth URL and Transmit URL
• Username, Password
• EBS MRA ID, Area Code
• Public Key Certificate
• Max Invoices Per Request (read‑only, defaults to 500)
• Optional: Enable PRF/TRN Invoices

Notes:

• Token + encryption key are cached automatically.
• Max Invoices Per Request limit is enforced for batch requests.

2. Company Fields (MRA Tab)

Required:

• TAN
• BRN
• Business Address

Optional:

• Trade Name
• Business Phone
• Person Type (VATR/NVTR)

3. Customer Fields (MRA Section)

Required only for B2B/B2G:

• Buyer Type
• TAN
• BRN (B2B only)

Other fields:

• Transaction Type (B2B/B2G/B2C/EXP/B2E)
• Business Address
• NIC / NCID

4. Tax Code Mapping

Create MRA Tax Code Map records that link:

• Item Tax Template
• Tax Code
• Nature (GOODS or SERVICES)

5. Item Tax Template (ERPNext Setup)

Step 1 — Create Sales Taxes & Charges Template

• Go to Accounts → Sales Taxes and Charges Template
• Create or select a VAT template (e.g. VAT 15%)
• This template defines the tax account (use your company VAT account) and rate

Step 2 — Create Item Tax Template

• Go to Accounts → Item Tax Template
• Name it clearly (e.g. MRA TC01 GOODS - B)
• Add a tax row pointing to your company VAT account and rate
• Save the template

Auto‑create option:

• On Company, click Create MRA Item Tax Templates.
• This generates standard MRA templates and maps them to tax codes.
  Update the tax accounts/rates to match your company setup if needed.

Step 3 — Map it to MRA Tax Code

• Create an MRA Tax Code Map
• Link the Item Tax Template
• Choose the correct Tax Code and Nature

Step 4 — Assign to Items

• On each Item, set Item Tax Template
• This is how the system decides which MRA Tax Code to send

Tip:

• You can also set a Default Item Tax Template on the Sales Invoice, but item‑level templates are required if you sell mixed goods/services.

Tax Code meanings (MRA Data Structure):

• TC01 = Taxable supplies at 15%
• TC02 = Taxable supplies at zero rate
• TC03 = Exempt supplies
• TC04 = Non‑fiscal items not affecting turnover
• TC05 = Standard rated supplies to exempt bodies/persons
• TC06 = Supplies outside VAT scope

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How It Works

Sales Invoice

On submit, CSF MU:

• Validates item tax templates and MRA mapping
• Validates buyer details for B2B/B2G
• Validates CRN/DRN requirements
• Builds payload and transmits to MRA
• Writes MRA Invoice Log and updates mra_status

Credit Note (CRN)

Use Return / Credit Note from a submitted invoice.

• return_against is required
• Reason Stated is required
• mra_invoice_type_desc is set to CRN

Debit Note (DRN)

Use Is Rate Adjustment Entry (Debit Note).

• return_against is required
• Reason Stated is required
• mra_invoice_type_desc is set to DRN

PRF / TRN

Enable Enable PRF/TRN Invoices in settings. The Invoice Type (MRA) field appears and allows PRF/TRN.

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Batch Transmit (Single Request)

Use Sales Invoice List → Send to MRA (Batch Request) to send many invoices in one request.

Limits:

• Max invoices per request: 500
• Max total items per request: 5000

Progress bar shows processing status.

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Logging

MRA Invoice Log

Stores:

• Request JSON
• Response JSON
• Status
• IRN
• QR Code
• Error details (child table: MRA Invoice Log Detail)

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Compliance Notes

• previousNoteHash is computed automatically using SHA‑256 and chained per invoice type.
• CRN/DRN must reference a SUCCESS fiscalised invoice.
• Buyer fields are enforced for B2B/B2G.

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Troubleshooting

Common causes of rejection:

• Missing Company TAN/BRN/Address
• Missing Customer buyer fields for B2B/B2G
• Missing MRA Tax Code Map
• Invalid return_against for CRN/DRN

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Test Case Coverage (MRA Portal)

• STD, CRN, DRN, PRF, TRN supported
• Batch transmit supports the 10‑invoice test case
• Failed scenario (wrong TAN) behaves as expected

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Support

For project setup or customizations, contact the implementation team.