feat: parse billing period (backport #100)

README.md

@@ -253,6 +253,9 @@ The following fields are currently extracted from the eInvoice:
     - Payee Account Name
     - Payee BIC
     - Payee IBAN
+- Billing Period
+    - Start Date
+    - End Date
 
 </details>
 

eu_einvoice/european_e_invoice/doctype/e_invoice_import/e_invoice_import.json

@@ -52,6 +52,10 @@
   "taxes",
   "due_date",
   "payment_terms",
+  "billing_period_section",
+  "billing_period_start",
+  "column_break_etpy",
+  "billing_period_end",
   "payment_means_section",
   "payee_account_name",
   "payee_iban",
@@ -359,6 +363,27 @@
    "fieldtype": "Data",
    "label": "BIC",
    "read_only": 1
+  },
+  {
+   "fieldname": "billing_period_section",
+   "fieldtype": "Section Break",
+   "label": "Billing Period"
+  },
+  {
+   "fieldname": "billing_period_start",
+   "fieldtype": "Date",
+   "label": "Billing Period Start",
+   "read_only": 1
+  },
+  {
+   "fieldname": "column_break_etpy",
+   "fieldtype": "Column Break"
+  },
+  {
+   "fieldname": "billing_period_end",
+   "fieldtype": "Date",
+   "label": "Billing Period End",
+   "read_only": 1
   }
  ],
  "index_web_pages_for_search": 1,
@@ -369,7 +394,7 @@
    "link_fieldname": "e_invoice_import"
   }
  ],
- "modified": "2025-02-12 23:47:22.751802",
+ "modified": "2025-02-13 00:31:19.390900",
  "modified_by": "Administrator",
  "module": "European e-Invoice",
  "name": "E Invoice Import",

eu_einvoice/european_e_invoice/doctype/e_invoice_import/e_invoice_import.py

@@ -22,7 +22,7 @@
 	from drafthorse.models.accounting import ApplicableTradeTax
 	from drafthorse.models.party import PostalTradeAddress, TradeParty
 	from drafthorse.models.payment import PaymentTerms
-	from drafthorse.models.trade import PaymentMeans
+	from drafthorse.models.trade import BillingSpecifiedPeriod, PaymentMeans
 	from drafthorse.models.tradelines import LineItem
 	from erpnext.accounts.doctype.purchase_invoice.purchase_invoice import PurchaseInvoice
 
@@ -45,6 +45,8 @@ class EInvoiceImport(Document):
 		)
 
 		amended_from: DF.Link | None
+		billing_period_end: DF.Date | None
+		billing_period_start: DF.Date | None
 		buyer_address_line_1: DF.Data | None
 		buyer_address_line_2: DF.Data | None
 		buyer_city: DF.Data | None
@@ -174,6 +176,7 @@ def read_values_from_einvoice(self) -> None:
 			self.parse_payment_term(term)
 
 		self.parse_bank_details(doc.trade.settlement.payment_means)
+		self.parse_billing_period(doc.trade.settlement.period)
 
 	def _validate_schematron(self, xml_bytes):
 		self.validation_errors = ""
@@ -283,6 +286,10 @@ def parse_bank_details(self, payment_means: "PaymentMeans"):
 			self.payee_account_name = payment_means.payee_account.account_name._text or None
 			self.payee_bic = payment_means.payee_institution.bic._text or None
 
+	def parse_billing_period(self, period: "BillingSpecifiedPeriod"):
+		self.billing_period_start = period.start._value
+		self.billing_period_end = period.end._value
+
 	def guess_supplier(self):
 		if self.supplier:
 			return
@@ -425,6 +432,8 @@ def process_payment_term(source, target, source_parent):
 					"id": "bill_no",
 					"issue_date": "bill_date",
 					"currency": "currency",
+					"billing_period_start": "from_date",
+					"billing_period_end": "to_date",
 				},
 				# "field_no_map": ["items"],
 			},