feat: add VAT exemption reason codes

README.md

@@ -37,6 +37,7 @@ Code List | Mapped DocType | Default Value
 [Codes for Units of Measure Used in International Trade](https://www.xrepository.de/api/xrepository/urn:xoev-de:kosit:codeliste:rec20_3:technischerBestandteilGenericode) | UOM | C62
 [Codes for Passengers, Types of Cargo, Packages and Packaging Materials](https://www.xrepository.de/api/xrepository/urn:xoev-de:kosit:codeliste:rec21_3:technischerBestandteilGenericode) (optional) | UOM | C62
 [Codes for Duty Tax and Fee Categories](https://www.xrepository.de/api/xrepository/urn:xoev-de:kosit:codeliste:untdid.5305_3:technischerBestandteilGenericode) | Item Tax Template, Account, Tax Category, Sales Taxes and Charges Template | S
+[VAT exemption reason code list](https://www.xrepository.de/api/xrepository/urn:xoev-de:kosit:codeliste:vatex_1:technischerBestandteilGenericode) | Item Tax Template, Account, Tax Category, Sales Taxes and Charges Template | vatex-eu-ae
 
 For example, let's say your standard **Payment Terms Template** is "Bank Transfer, 30 days". You'll need to find the suitable **Common Code** for bank transfers within the **Code List** "UNTDID.4461". In this case, the code is "58". Then you add a row to the _Applies To_ table, select "Payment Terms Template" as the _Link Document Type_ and "Bank Transfer, 30 days" as the _Link Name_. If you now create an Invoice with this **Payment Terms Template**, the eInvoice will contain the code "58" for the payment means, signalling that the payment should done via bank transfer.
 

eu_einvoice/european_e_invoice/custom/sales_invoice.py

@@ -19,6 +19,7 @@
 )
 payment_means_codes = CommonCodeRetriever(["urn:xoev-de:xrechnung:codeliste:untdid.4461_3"], "ZZZ")
 duty_tax_fee_category_codes = CommonCodeRetriever(["urn:xoev-de:kosit:codeliste:untdid.5305_3"], "S")
+vat_exemption_reason_codes = CommonCodeRetriever(["urn:xoev-de:kosit:codeliste:vatex_1"], "vatex-eu-ae")
 
 
 @frappe.whitelist()
@@ -171,6 +172,16 @@ def get_xml(invoice, company, seller_address=None, customer_address=None):
 				item.item_tax_template, invoice.taxes
 			)
 
+		if li.settlement.trade_tax.rate_applicable_percent._value == 0:
+			li.settlement.trade_tax.exemption_reason_code = vat_exemption_reason_codes.get(
+				[
+					("Item Tax Template", item.item_tax_template),
+					("Account", item.income_account),
+					("Tax Category", invoice.tax_category),
+					("Sales Taxes and Charges Template", invoice.taxes_and_charges),
+				]
+			)
+
 		li.settlement.monetary_summation.total_amount = item.amount
 		doc.trade.items.add(li)
 
@@ -263,6 +274,12 @@ def get_xml(invoice, company, seller_address=None, customer_address=None):
 		trade_tax.basis_amount = invoice.net_total
 		trade_tax.rate_applicable_percent = 0
 		trade_tax.calculated_amount = 0
+		trade_tax.exemption_reason_code = vat_exemption_reason_codes.get(
+			[
+				("Tax Category", invoice.tax_category),
+				("Sales Taxes and Charges Template", invoice.taxes_and_charges),
+			]
+		)
 		doc.trade.settlement.trade_tax.add(trade_tax)
 
 	for ps in invoice.payment_schedule: