feat(reports): get item details from Item doctype instead of the Transaction
diff --git a/erpnext/accounts/report/item_wise_purchase_register/item_wise_purchase_register.py b/erpnext/accounts/report/item_wise_purchase_register/item_wise_purchase_register.py
index 3445df7..a6d6a35 100644
--- a/erpnext/accounts/report/item_wise_purchase_register/item_wise_purchase_register.py
+++ b/erpnext/accounts/report/item_wise_purchase_register/item_wise_purchase_register.py
@@ -8,6 +8,7 @@
 from erpnext.accounts.report.item_wise_sales_register.item_wise_sales_register import (get_tax_accounts,
 	get_grand_total, add_total_row, get_display_value, get_group_by_and_display_fields, add_sub_total_row,
 	get_group_by_conditions)
+from erpnext.selling.report.item_wise_sales_history.item_wise_sales_history import get_item_details, get_customer_details
 
 def execute(filters=None):
 	return _execute(filters)
@@ -22,7 +23,7 @@
 	aii_account_map = get_aii_accounts()
 	if item_list:
 		itemised_tax, tax_columns = get_tax_accounts(item_list, columns, company_currency,
-			doctype="Purchase Invoice", tax_doctype="Purchase Taxes and Charges")
+			doctype='Purchase Invoice', tax_doctype='Purchase Taxes and Charges')
 
 	po_pr_map = get_purchase_receipts_against_purchase_order(item_list)
 
@@ -34,10 +35,14 @@
 	if filters.get('group_by'):
 		grand_total = get_grand_total(filters, 'Purchase Invoice')
 
+	item_details = get_item_details()
+
 	for d in item_list:
 		if not d.stock_qty:
 			continue
 
+		item_record = item_details.get(d.item_code)
+
 		purchase_receipt = None
 		if d.purchase_receipt:
 			purchase_receipt = d.purchase_receipt
@@ -48,8 +53,8 @@
 
 		row = {
 			'item_code': d.item_code,
-			'item_name': d.item_name,
-			'item_group': d.item_group,
+			'item_name': item_record.item_name,
+			'item_group': item_record.item_group,
 			'description': d.description,
 			'invoice': d.parent,
 			'posting_date': d.posting_date,
@@ -81,10 +86,10 @@
 		for tax in tax_columns:
 			item_tax = itemised_tax.get(d.name, {}).get(tax, {})
 			row.update({
-				frappe.scrub(tax + ' Rate'): item_tax.get("tax_rate", 0),
-				frappe.scrub(tax + ' Amount'): item_tax.get("tax_amount", 0),
+				frappe.scrub(tax + ' Rate'): item_tax.get('tax_rate', 0),
+				frappe.scrub(tax + ' Amount'): item_tax.get('tax_amount', 0),
 			})
-			total_tax += flt(item_tax.get("tax_amount"))
+			total_tax += flt(item_tax.get('tax_amount'))
 
 		row.update({
 			'total_tax': total_tax,
@@ -309,8 +314,8 @@
 		select
 			`tabPurchase Invoice Item`.`name`, `tabPurchase Invoice Item`.`parent`,
 			`tabPurchase Invoice`.posting_date, `tabPurchase Invoice`.credit_to, `tabPurchase Invoice`.company,
-			`tabPurchase Invoice`.supplier, `tabPurchase Invoice`.remarks, `tabPurchase Invoice`.base_net_total, `tabPurchase Invoice Item`.`item_code`,
-			`tabPurchase Invoice Item`.`item_name`, `tabPurchase Invoice Item`.`item_group`, `tabPurchase Invoice Item`.description,
+			`tabPurchase Invoice`.supplier, `tabPurchase Invoice`.remarks, `tabPurchase Invoice`.base_net_total,
+			`tabPurchase Invoice Item`.`item_code`, `tabPurchase Invoice Item`.description,
 			`tabPurchase Invoice Item`.`project`, `tabPurchase Invoice Item`.`purchase_order`,
 			`tabPurchase Invoice Item`.`purchase_receipt`, `tabPurchase Invoice Item`.`po_detail`,
 			`tabPurchase Invoice Item`.`expense_account`, `tabPurchase Invoice Item`.`stock_qty`,
diff --git a/erpnext/accounts/report/item_wise_sales_register/item_wise_sales_register.py b/erpnext/accounts/report/item_wise_sales_register/item_wise_sales_register.py
index a05dcd7..f54ceb0 100644
--- a/erpnext/accounts/report/item_wise_sales_register/item_wise_sales_register.py
+++ b/erpnext/accounts/report/item_wise_sales_register/item_wise_sales_register.py
@@ -8,6 +8,7 @@
 from frappe.model.meta import get_field_precision
 from frappe.utils.xlsxutils import handle_html
 from erpnext.accounts.report.sales_register.sales_register import get_mode_of_payments
+from erpnext.selling.report.item_wise_sales_history.item_wise_sales_history import get_item_details, get_customer_details
 
 def execute(filters=None):
 	return _execute(filters)
@@ -16,7 +17,7 @@
 	if not filters: filters = {}
 	columns = get_columns(additional_table_columns, filters)
 
-	company_currency = frappe.get_cached_value('Company',  filters.get("company"),  "default_currency")
+	company_currency = frappe.get_cached_value('Company',  filters.get('company'),  'default_currency')
 
 	item_list = get_items(filters, additional_query_columns)
 	if item_list:
@@ -33,7 +34,13 @@
 	if filters.get('group_by'):
 		grand_total = get_grand_total(filters, 'Sales Invoice')
 
+	customer_details = get_customer_details()
+	item_details = get_item_details()
+
 	for d in item_list:
+		customer_record = customer_details.get(d.customer)
+		item_record = item_details.get(d.item_code)
+
 		delivery_note = None
 		if d.delivery_note:
 			delivery_note = d.delivery_note
@@ -45,14 +52,14 @@
 
 		row = {
 			'item_code': d.item_code,
-			'item_name': d.item_name,
-			'item_group': d.item_group,
+			'item_name': item_record.item_name,
+			'item_group': item_record.item_group,
 			'description': d.description,
 			'invoice': d.parent,
 			'posting_date': d.posting_date,
 			'customer': d.customer,
-			'customer_name': d.customer_name,
-			'customer_group': d.customer_group,
+			'customer_name': customer_record.customer_name,
+			'customer_group': customer_record.customer_group,
 		}
 
 		if additional_query_columns:
@@ -90,10 +97,10 @@
 		for tax in tax_columns:
 			item_tax = itemised_tax.get(d.name, {}).get(tax, {})
 			row.update({
-				frappe.scrub(tax + ' Rate'): item_tax.get("tax_rate", 0),
-				frappe.scrub(tax + ' Amount'): item_tax.get("tax_amount", 0),
+				frappe.scrub(tax + ' Rate'): item_tax.get('tax_rate', 0),
+				frappe.scrub(tax + ' Amount'): item_tax.get('tax_amount', 0),
 			})
-			total_tax += flt(item_tax.get("tax_amount"))
+			total_tax += flt(item_tax.get('tax_amount'))
 
 		row.update({
 			'total_tax': total_tax,
@@ -226,7 +233,7 @@
 	if filters.get('group_by') != 'Territory':
 		columns.extend([
 			{
-				'label': _("Territory"),
+				'label': _('Territory'),
 				'fieldname': 'territory',
 				'fieldtype': 'Link',
 				'options': 'Territory',
@@ -374,13 +381,12 @@
 			`tabSales Invoice`.posting_date, `tabSales Invoice`.debit_to,
 			`tabSales Invoice`.project, `tabSales Invoice`.customer, `tabSales Invoice`.remarks,
 			`tabSales Invoice`.territory, `tabSales Invoice`.company, `tabSales Invoice`.base_net_total,
-			`tabSales Invoice Item`.item_code, `tabSales Invoice Item`.item_name,
-			`tabSales Invoice Item`.item_group, `tabSales Invoice Item`.description, `tabSales Invoice Item`.sales_order,
-			`tabSales Invoice Item`.delivery_note, `tabSales Invoice Item`.income_account,
-			`tabSales Invoice Item`.cost_center, `tabSales Invoice Item`.stock_qty,
-			`tabSales Invoice Item`.stock_uom, `tabSales Invoice Item`.base_net_rate,
-			`tabSales Invoice Item`.base_net_amount, `tabSales Invoice`.customer_name,
-			`tabSales Invoice`.customer_group, `tabSales Invoice Item`.so_detail,
+			`tabSales Invoice Item`.item_code, `tabSales Invoice Item`.description,
+			`tabSales Invoice Item`.sales_order, `tabSales Invoice Item`.delivery_note,
+			`tabSales Invoice Item`.income_account, `tabSales Invoice Item`.cost_center,
+			`tabSales Invoice Item`.stock_qty, `tabSales Invoice Item`.stock_uom,
+			`tabSales Invoice Item`.base_net_rate, `tabSales Invoice Item`.base_net_amount,
+			`tabSales Invoice`.customer_name, `tabSales Invoice`.customer_group, `tabSales Invoice Item`.so_detail,
 			`tabSales Invoice`.update_stock, `tabSales Invoice Item`.uom, `tabSales Invoice Item`.qty {0}
 		from `tabSales Invoice`, `tabSales Invoice Item`
 		where `tabSales Invoice`.name = `tabSales Invoice Item`.parent
@@ -417,14 +423,14 @@
 	return frappe.db.sql_list("select name from `tabPurchase Taxes and Charges` where add_deduct_tax = 'Deduct'")
 
 def get_tax_accounts(item_list, columns, company_currency,
-		doctype="Sales Invoice", tax_doctype="Sales Taxes and Charges"):
+		doctype='Sales Invoice', tax_doctype='Sales Taxes and Charges'):
 	import json
 	item_row_map = {}
 	tax_columns = []
 	invoice_item_row = {}
 	itemised_tax = {}
 
-	tax_amount_precision = get_field_precision(frappe.get_meta(tax_doctype).get_field("tax_amount"),
+	tax_amount_precision = get_field_precision(frappe.get_meta(tax_doctype).get_field('tax_amount'),
 		currency=company_currency) or 2
 
 	for d in item_list:
@@ -469,8 +475,8 @@
 						tax_rate = tax_data
 						tax_amount = 0
 
-					if charge_type == "Actual" and not tax_rate:
-						tax_rate = "NA"
+					if charge_type == 'Actual' and not tax_rate:
+						tax_rate = 'NA'
 
 					item_net_amount = sum([flt(d.base_net_amount)
 						for d in item_row_map.get(parent, {}).get(item_code, [])])
@@ -484,17 +490,17 @@
 								if (doctype == 'Purchase Invoice' and name in deducted_tax) else tax_value)
 
 							itemised_tax.setdefault(d.name, {})[description] = frappe._dict({
-								"tax_rate": tax_rate,
-								"tax_amount": tax_value
+								'tax_rate': tax_rate,
+								'tax_amount': tax_value
 							})
 
 			except ValueError:
 				continue
-		elif charge_type == "Actual" and tax_amount:
+		elif charge_type == 'Actual' and tax_amount:
 			for d in invoice_item_row.get(parent, []):
 				itemised_tax.setdefault(d.name, {})[description] = frappe._dict({
-					"tax_rate": "NA",
-					"tax_amount": flt((tax_amount * d.base_net_amount) / d.base_net_total,
+					'tax_rate': 'NA',
+					'tax_amount': flt((tax_amount * d.base_net_amount) / d.base_net_total,
 						tax_amount_precision)
 				})
 
@@ -563,7 +569,7 @@
 		})
 
 		total_row_map.setdefault('total_row', {
-			subtotal_display_field: "Total",
+			subtotal_display_field: 'Total',
 			'stock_qty': 0.0,
 			'amount': 0.0,
 			'bold': 1,
diff --git a/erpnext/selling/report/item_wise_sales_history/item_wise_sales_history.py b/erpnext/selling/report/item_wise_sales_history/item_wise_sales_history.py
index c716aa9..8473276 100644
--- a/erpnext/selling/report/item_wise_sales_history/item_wise_sales_history.py
+++ b/erpnext/selling/report/item_wise_sales_history/item_wise_sales_history.py
@@ -10,8 +10,8 @@
 def execute(filters=None):
 	filters = frappe._dict(filters or {})
 	if filters.from_date > filters.to_date:
-		frappe.throw(_('From Date cannot be greater than To Date'))
-	
+		frappe.throw(_("From Date cannot be greater than To Date"))
+
 	columns = get_columns(filters)
 	data = get_data(filters)
 
@@ -148,14 +148,16 @@
 	company_list.append(filters.get("company"))
 
 	customer_details = get_customer_details()
+	item_details = get_item_details()
 	sales_order_records = get_sales_order_details(company_list, filters)
 
 	for record in sales_order_records:
 		customer_record = customer_details.get(record.customer)
+		item_record = item_details.get(record.item_code)
 		row = {
 			"item_code": record.item_code,
-			"item_name": record.item_name,
-			"item_group": record.item_group,
+			"item_name": item_record.item_name,
+			"item_group": item_record.item_group,
 			"description": record.description,
 			"quantity": record.qty,
 			"uom": record.uom,
@@ -196,8 +198,8 @@
 	return conditions
 
 def get_customer_details():
-	details = frappe.get_all('Customer',
-		fields=['name', 'customer_name', "customer_group"])
+	details = frappe.get_all("Customer",
+		fields=["name", "customer_name", "customer_group"])
 	customer_details = {}
 	for d in details:
 		customer_details.setdefault(d.name, frappe._dict({
@@ -206,15 +208,25 @@
 		}))
 	return customer_details
 
+def get_item_details():
+	details = frappe.db.get_all("Item",
+		fields=["item_code", "item_name", "item_group"])
+	item_details = {}
+	for d in details:
+		item_details.setdefault(d.item_code, frappe._dict({
+			"item_name": d.item_name,
+			"item_group": d.item_group
+		}))
+	return item_details
+
 def get_sales_order_details(company_list, filters):
 	conditions = get_conditions(filters)
 
 	return frappe.db.sql("""
 		SELECT
-			so_item.item_code, so_item.item_name, so_item.item_group,
-			so_item.description, so_item.qty, so_item.uom,
-			so_item.base_rate, so_item.base_amount, so.name,
-			so.transaction_date, so.customer, so.territory,
+			so_item.item_code, so_item.description, so_item.qty,
+			so_item.uom, so_item.base_rate, so_item.base_amount,
+			so.name, so.transaction_date, so.customer,so.territory,
 			so.project, so_item.delivered_qty,
 			so_item.billed_amt, so.company
 		FROM