fix(gle): GL Entry for invoices before introduction of rounding_adjustment (#15732)

diff --git a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
index 5d11797..dcfd8bb 100644
--- a/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
+++ b/erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py
@@ -363,7 +363,10 @@
 		return gl_entries
 
 	def make_supplier_gl_entry(self, gl_entries):
-		grand_total = self.rounded_total or self.grand_total
+		# Checked both rounding_adjustment and rounded_total 
+		# because rounded_total had value even before introcution of posting GLE based on rounded total
+		grand_total = self.rounded_total if (self.rounding_adjustment and self.rounded_total) else self.grand_total
+
 		if grand_total:
 			# Didnot use base_grand_total to book rounding loss gle
 			grand_total_in_company_currency = flt(grand_total * self.conversion_rate,
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
index 27d35eb..a6cd352 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.py
@@ -641,7 +641,9 @@
 		return gl_entries
 
 	def make_customer_gl_entry(self, gl_entries):
-		grand_total = self.rounded_total or self.grand_total
+		# Checked both rounding_adjustment and rounded_total 
+		# because rounded_total had value even before introcution of posting GLE based on rounded total
+		grand_total = self.rounded_total if (self.rounding_adjustment and self.rounded_total) else self.grand_total
 		if grand_total:
 			# Didnot use base_grand_total to book rounding loss gle
 			grand_total_in_company_currency = flt(grand_total * self.conversion_rate,