validate: check additional salary component exists (#17530)

erpnext/hr/doctype/additional_salary/additional_salary.py

@@ -9,6 +9,12 @@ from frappe import _
 from frappe.utils import getdate, date_diff
 
 class AdditionalSalary(Document):
+	def before_insert(self):
+		if frappe.db.exists("Additional Salary", {"employee": self.employee, "salary_component": self.salary_component,
+			"amount": self.amount, "payroll_date": self.payroll_date, "company": self.company}):
+
+			frappe.throw(_("Additional Salary Component Exists."))
+
 	def validate(self):
 		self.validate_dates()
 		if self.amount < 0: