feat: Validity for Item taxes (#20135)

* feat: Validity for Item taxes

* fix: Trigger for gst hsn code

* fix: Sort taxes based on validity

* fix: Validation for item tax template and filters based on validity

* fix: Add missing semicolon

* fix: Validate tax template only if item code available

* fix: Do not validate or filter item tax template if no item taxes applied

* fix: Consider item group for validating taxes

* fix: Test cases for item tax  validation

* fix: Item tax template filtering fixes

* fix: Add missing semicolon

* fix: Remove unnecessary query

erpnext/public/js/controllers/transaction.js

@@ -1700,6 +1700,29 @@ erpnext.TransactionController = erpnext.taxes_and_totals.extend({
 		}
 	},
 
+	set_query_for_item_tax_template: function(doc, cdt, cdn) {
+
+		var item = frappe.get_doc(cdt, cdn);
+		if(!item.item_code) {
+			frappe.throw(__("Please enter Item Code to get item taxes"));
+		} else {
+
+			let filters = {
+				'item_code': item.item_code,
+				'valid_from': doc.transaction_date || doc.bill_date || doc.posting_date,
+				'item_group': item.item_group,
+			}
+
+			if (doc.tax_category)
+				filters['tax_category'] = doc.tax_category;
+
+			return {
+				query: "erpnext.controllers.queries.get_tax_template",
+				filters: filters
+			}
+		}
+	},
+
 	payment_terms_template: function() {
 		var me = this;
 		const doc = this.frm.doc;