fix: add patch to update base_outstanding and base_paid_amount

Author: Sugesh393

erpnext/patches.txt

@@ -408,3 +408,4 @@ erpnext.patches.v15_0.rename_sla_fields
 erpnext.stock.doctype.stock_ledger_entry.patches.ensure_sle_indexes
 erpnext.patches.v15_0.update_query_report
 erpnext.patches.v15_0.set_purchase_receipt_row_item_to_capitalization_stock_item
+erpnext.patches.v15_0.update_payment_schedule_fields_in_invoices

erpnext/patches/v15_0/update_payment_schedule_fields_in_invoices.py

@@ -0,0 +1,18 @@
+import frappe
+from frappe.query_builder import DocType
+
+
+def execute():
+	invoice_types = ["Sales Invoice", "Purchase Invoice"]
+	for invoice_type in invoice_types:
+		invoice = DocType(invoice_type)
+		invoice_details = frappe.qb.from_(invoice).select(invoice.conversion_rate, invoice.name)
+		update_payment_schedule(invoice_details)
+
+
+def update_payment_schedule(invoice_details):
+	ps = DocType("Payment Schedule")
+
+	frappe.qb.update(ps).join(invoice_details).on(ps.parent == invoice_details.name).set(
+		ps.base_paid_amount, ps.paid_amount * invoice_details.conversion_rate
+	).set(ps.base_outstanding, ps.outstanding * invoice_details.conversion_rate).run()