feat: Merge taxes from mapped docs

erpnext/public/js/utils.js

@@ -843,7 +843,7 @@ erpnext.utils.map_current_doc = function(opts) {
 			freeze_message: __("Mapping {0} ...", [opts.source_doctype]),
 			callback: function(r) {
 				if(!r.exc) {
-					var doc = frappe.model.sync(r.message);
+					frappe.model.sync(r.message);
 					cur_frm.dirty();
 					cur_frm.refresh();
 				}
@@ -870,6 +870,11 @@ erpnext.utils.map_current_doc = function(opts) {
 			target: opts.target,
 			date_field: opts.date_field || undefined,
 			setters: opts.setters,
+			data_fields: [{
+				fieldname: 'merge_taxes',
+				fieldtype: 'Check',
+				label: __('Merge taxes from multiple documents'),
+			}],
 			get_query: opts.get_query,
 			add_filters_group: 1,
 			allow_child_item_selection: opts.allow_child_item_selection,
@@ -883,10 +888,7 @@ erpnext.utils.map_current_doc = function(opts) {
 					return;
 				}
 				opts.source_name = values;
-				if (opts.allow_child_item_selection) {
-					// args contains filtered child docnames
-					opts.args = args;
-				}
+				opts.args = args;
 				d.dialog.hide();
 				_map();
 			},

erpnext/stock/doctype/purchase_receipt/purchase_receipt.py

@@ -1009,8 +1009,39 @@ def get_item_wise_returned_qty(pr_doc):
 	)
 
 
+def merge_taxes(source_taxes, target_doc):
+	from erpnext.accounts.doctype.pos_invoice_merge_log.pos_invoice_merge_log import (
+		update_item_wise_tax_detail,
+	)
+
+	existing_taxes = target_doc.get("taxes") or []
+	idx = 1
+	for tax in source_taxes:
+		found = False
+		for t in existing_taxes:
+			if t.account_head == tax.account_head and t.cost_center == tax.cost_center:
+				t.tax_amount = flt(t.tax_amount) + flt(tax.tax_amount_after_discount_amount)
+				t.base_tax_amount = flt(t.base_tax_amount) + flt(tax.base_tax_amount_after_discount_amount)
+				update_item_wise_tax_detail(t, tax)
+				found = True
+
+		if not found:
+			tax.charge_type = "Actual"
+			tax.idx = idx
+			idx += 1
+			tax.included_in_print_rate = 0
+			tax.dont_recompute_tax = 1
+			tax.row_id = ""
+			tax.tax_amount = tax.tax_amount_after_discount_amount
+			tax.base_tax_amount = tax.base_tax_amount_after_discount_amount
+			tax.item_wise_tax_detail = tax.item_wise_tax_detail
+			existing_taxes.append(tax)
+
+	target_doc.set("taxes", existing_taxes)
+
+
 @frappe.whitelist()
-def make_purchase_invoice(source_name, target_doc=None):
+def make_purchase_invoice(source_name, target_doc=None, args=None):
 	from erpnext.accounts.party import get_payment_terms_template
 
 	doc = frappe.get_doc("Purchase Receipt", source_name)
@@ -1027,6 +1058,10 @@ def set_missing_values(source, target):
 		)
 		doc.run_method("onload")
 		doc.run_method("set_missing_values")
+
+		if args.get("merge_taxes"):
+			merge_taxes(source.get("taxes") or [], doc)
+
 		doc.run_method("calculate_taxes_and_totals")
 		doc.set_payment_schedule()
 
@@ -1090,7 +1125,11 @@ def get_pending_qty(item_row):
 				if not doc.get("is_return")
 				else get_pending_qty(d)[0] > 0,
 			},
-			"Purchase Taxes and Charges": {"doctype": "Purchase Taxes and Charges", "add_if_empty": True},
+			"Purchase Taxes and Charges": {
+				"doctype": "Purchase Taxes and Charges",
+				"add_if_empty": True,
+				"ignore": args.get("merge_taxes"),
+			},
 		},
 		target_doc,
 		set_missing_values,