diff --git a/templates/xml/factur-x-basic.xml.j2.back b/templates/xml/factur-x-basic.xml.j2.back
deleted file mode 100644
index 654bb02..0000000
--- a/templates/xml/factur-x-basic.xml.j2.back
+++ /dev/null
@@ -1,180 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<rsm:CrossIndustryInvoice
-    xmlns:rsm="urn:un:unece:uncefact:data:standard:CrossIndustryInvoice:100"
-    xmlns:ram="urn:un:unece:uncefact:data:standard:ReusableAggregateBusinessInformationEntity:100"
-    xmlns:udt="urn:un:unece:uncefact:data:standard:UnqualifiedDataType:100"
-    xmlns:qdt="urn:un:unece:uncefact:data:standard:QualifiedDataType:100"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-
-  <!-- 1. CONTEXTE -->
-  <rsm:ExchangedDocumentContext>
-    <ram:GuidelineSpecifiedDocumentContextParameter>
-      <ram:ID>urn:cen.eu:en16931:2017#compliant#urn:factur-x.eu:1p0:basic</ram:ID>
-    </ram:GuidelineSpecifiedDocumentContextParameter>
-  </rsm:ExchangedDocumentContext>
-
-  <!-- 2. EN-TÊTE FACTURE -->
-  <rsm:ExchangedDocument>
-    <ram:ID>{{ invoice.number }}</ram:ID>
-    <ram:TypeCode>{{ invoice.type_code }}</ram:TypeCode>
-    <ram:IssueDateTime>
-      <udt:DateTimeString format="102">{{ invoice.issue_date | datefmt }}</udt:DateTimeString>
-    </ram:IssueDateTime>
-    {% if invoice.note %}
-    <ram:IncludedNote>
-      <ram:Content>{{ invoice.note }}</ram:Content>
-    </ram:IncludedNote>
-    {% endif %}
-  </rsm:ExchangedDocument>
-
-  <!-- 3. TRANSACTION COMMERCIALE -->
-  <rsm:SupplyChainTradeTransaction>
-
-    <!-- 3a. Lignes de facture -->
-    {% for line in invoice.lines %}
-    <ram:IncludedSupplyChainTradeLineItem>
-      <ram:AssociatedDocumentLineDocument>
-        <ram:LineID>{{ line.line_id }}</ram:LineID>
-      </ram:AssociatedDocumentLineDocument>
-      <ram:SpecifiedTradeProduct>
-        <ram:Name>{{ line.description }}</ram:Name>
-      </ram:SpecifiedTradeProduct>
-      <ram:SpecifiedLineTradeAgreement>
-        <ram:NetPriceProductTradePrice>
-          <ram:ChargeAmount>{{ line.unit_price | amount }}</ram:ChargeAmount>
-        </ram:NetPriceProductTradePrice>
-      </ram:SpecifiedLineTradeAgreement>
-      <ram:SpecifiedLineTradeDelivery>
-        <ram:BilledQuantity unitCode="{{ line.unit_code }}">{{ line.quantity | amount }}</ram:BilledQuantity>
-      </ram:SpecifiedLineTradeDelivery>
-      <ram:SpecifiedLineTradeSettlement>
-        <ram:ApplicableTradeTax>
-          <ram:TypeCode>VAT</ram:TypeCode>
-          <ram:CategoryCode>{{ line.vat_category }}</ram:CategoryCode>
-          <ram:RateApplicablePercent>{{ line.vat_rate | amount }}</ram:RateApplicablePercent>
-        </ram:ApplicableTradeTax>
-        <ram:SpecifiedTradeSettlementLineMonetarySummation>
-          <ram:LineTotalAmount>{{ (line.quantity * line.unit_price) | amount }}</ram:LineTotalAmount>
-        </ram:SpecifiedTradeSettlementLineMonetarySummation>
-      </ram:SpecifiedLineTradeSettlement>
-    </ram:IncludedSupplyChainTradeLineItem>
-    {% endfor %}
-
-    <!-- 3b. Accord commercial -->
-    <ram:ApplicableHeaderTradeAgreement>
-
-      <ram:SellerTradeParty>
-        <ram:Name>{{ seller.name }}</ram:Name>
-        {% if seller.siret %}
-        <ram:SpecifiedLegalOrganization>
-          <ram:ID schemeID="0002">{{ seller.siret }}</ram:ID>
-        </ram:SpecifiedLegalOrganization>
-        {% endif %}
-        {% if seller.address %}
-        <ram:PostalTradeAddress>
-          <ram:PostcodeCode>{{ seller.address.postcode }}</ram:PostcodeCode>
-          <ram:LineOne>{{ seller.address.line1 }}</ram:LineOne>
-          {% if seller.address.line2 %}
-          <ram:LineTwo>{{ seller.address.line2 }}</ram:LineTwo>
-          {% endif %}
-          <ram:CityName>{{ seller.address.city }}</ram:CityName>
-          <ram:CountryID>{{ seller.address.country_code }}</ram:CountryID>
-        </ram:PostalTradeAddress>
-        {% endif %}
-        {% if seller.vat_id %}
-        <ram:SpecifiedTaxRegistration>
-          <ram:ID schemeID="VA">{{ seller.vat_id }}</ram:ID>
-        </ram:SpecifiedTaxRegistration>
-        {% endif %}
-      </ram:SellerTradeParty>
-
-      <ram:BuyerTradeParty>
-        <ram:Name>{{ buyer.name }}</ram:Name>
-        {% if buyer.siret %}
-        <ram:SpecifiedLegalOrganization>
-          <ram:ID schemeID="0002">{{ buyer.siret }}</ram:ID>
-        </ram:SpecifiedLegalOrganization>
-        {% endif %}
-        {% if buyer.address %}
-        <ram:PostalTradeAddress>
-          <ram:PostcodeCode>{{ buyer.address.postcode }}</ram:PostcodeCode>
-          <ram:LineOne>{{ buyer.address.line1 }}</ram:LineOne>
-          {% if buyer.address.line2 %}
-          <ram:LineTwo>{{ buyer.address.line2 }}</ram:LineTwo>
-          {% endif %}
-          <ram:CityName>{{ buyer.address.city }}</ram:CityName>
-          <ram:CountryID>{{ buyer.address.country_code }}</ram:CountryID>
-        </ram:PostalTradeAddress>
-        {% endif %}
-      </ram:BuyerTradeParty>
-
-      {% if invoice.payment_reference %}
-      <ram:BuyerOrderReferencedDocument>
-        <ram:IssuerAssignedID>{{ invoice.payment_reference }}</ram:IssuerAssignedID>
-      </ram:BuyerOrderReferencedDocument>
-      {% endif %}
-
-    </ram:ApplicableHeaderTradeAgreement>
-
-    <!-- 3c. Livraison -->
-    <ram:ApplicableHeaderTradeDelivery>
-      <ram:ShipToTradeParty>
-        <ram:Name>{{ buyer.name }}</ram:Name>
-      </ram:ShipToTradeParty>
-    </ram:ApplicableHeaderTradeDelivery>
-
-    <!-- 3d. Règlement -->
-    <ram:ApplicableHeaderTradeSettlement>
-      <ram:InvoiceCurrencyCode>{{ invoice.currency }}</ram:InvoiceCurrencyCode>
-
-      <ram:SpecifiedTradeSettlementPaymentMeans>
-        <ram:TypeCode>{{ invoice.payment_means_code }}</ram:TypeCode>
-        {% if invoice.iban %}
-        <ram:PayeePartyCreditorFinancialAccount>
-          <ram:IBANID>{{ invoice.iban }}</ram:IBANID>
-        </ram:PayeePartyCreditorFinancialAccount>
-        {% endif %}
-      </ram:SpecifiedTradeSettlementPaymentMeans>
-
-      {% for tax in invoice.tax_lines %}
-      <ram:ApplicableTradeTax>
-          <ram:CalculatedAmount>{{ tax.amount | amount }}</ram:CalculatedAmount>
-          <ram:TypeCode>VAT</ram:TypeCode>
-          {% if tax.exemption_reason %}
-          <ram:ExemptionReason>{{ tax.exemption_reason }}</ram:ExemptionReason>
-          {% endif %}
-          <ram:BasisAmount>{{ tax.base_amount | amount }}</ram:BasisAmount>
-          <ram:CategoryCode>{{ tax.category }}</ram:CategoryCode>
-          <ram:RateApplicablePercent>{{ tax.rate | amount }}</ram:RateApplicablePercent>
-      </ram:ApplicableTradeTax>
-
-
-      <ram:ApplicableTradeTax>
-        <ram:CalculatedAmount>{{ tax.amount | amount }}</ram:CalculatedAmount>
-        <ram:TypeCode>VAT</ram:TypeCode>
-        <ram:BasisAmount>{{ tax.base_amount | amount }}</ram:BasisAmount>
-        <ram:CategoryCode>{{ tax.category }}</ram:CategoryCode>
-        <ram:RateApplicablePercent>{{ tax.rate | amount }}</ram:RateApplicablePercent>
-      </ram:ApplicableTradeTax>
-      {% endfor %}
-
-      {% if invoice.due_date %}
-      <ram:SpecifiedTradePaymentTerms>
-        <ram:DueDateDateTime>
-          <udt:DateTimeString format="102">{{ invoice.due_date | datefmt }}</udt:DateTimeString>
-        </ram:DueDateDateTime>
-      </ram:SpecifiedTradePaymentTerms>
-      {% endif %}
-
-      <ram:SpecifiedTradeSettlementHeaderMonetarySummation>
-        <ram:LineTotalAmount>{{ invoice.total_ht | amount }}</ram:LineTotalAmount>
-        <ram:TaxBasisTotalAmount>{{ invoice.total_ht | amount }}</ram:TaxBasisTotalAmount>
-        <ram:TaxTotalAmount currencyID="{{ invoice.currency }}">{{ invoice.total_tva | amount }}</ram:TaxTotalAmount>
-        <ram:GrandTotalAmount>{{ invoice.total_ttc | amount }}</ram:GrandTotalAmount>
-        <ram:DuePayableAmount>{{ invoice.total_ttc | amount }}</ram:DuePayableAmount>
-      </ram:SpecifiedTradeSettlementHeaderMonetarySummation>
-
-    </ram:ApplicableHeaderTradeSettlement>
-
-  </rsm:SupplyChainTradeTransaction>
-</rsm:CrossIndustryInvoice>