refactor: do currency conversion on future amount columns

erpnext/accounts/report/accounts_receivable/accounts_receivable.py

@@ -5,7 +5,7 @@
 from collections import OrderedDict
 
 import frappe
-from frappe import _, qb, scrub
+from frappe import _, qb, query_builder, scrub
 from frappe.query_builder import Criterion
 from frappe.query_builder.functions import Date, Substring, Sum
 from frappe.utils import cint, cstr, flt, getdate, nowdate
@@ -576,6 +576,8 @@ def get_future_payments(self):
 	def get_future_payments_from_payment_entry(self):
 		pe = frappe.qb.DocType("Payment Entry")
 		pe_ref = frappe.qb.DocType("Payment Entry Reference")
+		ifelse = query_builder.CustomFunction("IF", ["condition", "then", "else"])
+
 		return (
 			frappe.qb.from_(pe)
 			.inner_join(pe_ref)
@@ -587,6 +589,11 @@ def get_future_payments_from_payment_entry(self):
 				(pe.posting_date).as_("future_date"),
 				(pe_ref.allocated_amount).as_("future_amount"),
 				(pe.reference_no).as_("future_ref"),
+				ifelse(
+					pe.payment_type == "Receive",
+					pe.source_exchange_rate * pe_ref.allocated_amount,
+					pe.target_exchange_rate * pe_ref.allocated_amount,
+				).as_("future_amount_in_base_currency"),
 			)
 			.where(
 				(pe.docstatus < 2)
@@ -623,13 +630,24 @@ def get_future_payments_from_journal_entry(self):
 				query = query.select(
 					Sum(jea.debit_in_account_currency - jea.credit_in_account_currency).as_("future_amount")
 				)
+				query = query.select(Sum(jea.debit - jea.credit).as_("future_amount_in_base_currency"))
 			else:
 				query = query.select(
 					Sum(jea.credit_in_account_currency - jea.debit_in_account_currency).as_("future_amount")
 				)
+				query = query.select(Sum(jea.credit - jea.debit).as_("future_amount_in_base_currency"))
 		else:
 			query = query.select(
-				Sum(jea.debit if self.account_type == "Payable" else jea.credit).as_("future_amount")
+				Sum(jea.debit if self.account_type == "Payable" else jea.credit).as_(
+					"future_amount_in_base_currency"
+				)
+			)
+			query = query.select(
+				Sum(
+					jea.debit_in_account_currency
+					if self.account_type == "Payable"
+					else jea.credit_in_account_currency
+				).as_("future_amount")
 			)
 
 		query = query.having(qb.Field("future_amount") > 0)
@@ -645,14 +663,19 @@ def allocate_future_payments(self, row):
 		row.remaining_balance = row.outstanding
 		row.future_amount = 0.0
 		for future in self.future_payments.get((row.voucher_no, row.party), []):
-			if row.remaining_balance > 0 and future.future_amount:
-				if future.future_amount > row.outstanding:
+			if self.filters.in_party_currency:
+				future_amount_field = "future_amount"
+			else:
+				future_amount_field = "future_amount_in_base_currency"
+
+			if row.remaining_balance > 0 and future.get(future_amount_field):
+				if future.get(future_amount_field) > row.outstanding:
 					row.future_amount = row.outstanding
-					future.future_amount = future.future_amount - row.outstanding
+					future[future_amount_field] = future.get(future_amount_field) - row.outstanding
 					row.remaining_balance = 0
 				else:
-					row.future_amount += future.future_amount
-					future.future_amount = 0
+					row.future_amount += future.get(future_amount_field)
+					future[future_amount_field] = 0
 					row.remaining_balance = row.outstanding - row.future_amount
 
 				row.setdefault("future_ref", []).append(