edit

erpnext/payroll/doctype/salary_slip/salary_slip.py

@@ -330,7 +330,18 @@ def get_working_days_details(
 		diff_list = Counter(shift_days)
 		diff_days = [k for k,v in diff_list.items() if v == 1 ]
 		count_same_days = [item for item, count in collections.Counter(shift_days).items() if count > 1]
-		count = 0
+		count_same = 0
+		count_diff = 0
+		set_shift = set()
+		shift_same = 0
+		shift_diff = 0
+		for i in diff_list:
+			set_shift.add(diff_list[i])
+		for j in set_shift:
+			if j == 1:
+				shift_diff = j
+			else:
+				shift_same = j
 
 		import datetime, calendar
 		currentDate = datetime.date.today()
@@ -339,10 +350,12 @@ def get_working_days_details(
 		for i in range(1, daysInMonth+1):
 			day = datetime.datetime(currentDate.year, currentDate.month, i)
 			days.append(calendar.day_name[day.weekday()])
+
+		for x,y in zip(count_same_days,diff_days):
+			count_same += days.count(x)
+			count_diff += days.count(y)
 
-		for x in count_same_days:
-			count += days.count(x)
-		work_shifts = (count + len(diff_days)) * len(employee_shifts)
+		work_shifts = ((count_same*shift_same) + (count_diff * shift_diff))
 		holidays = self.get_holidays_for_employee(self.start_date, self.end_date)
 		number_of_holiday_shift = frappe.db.get_single_value(
 			"Payroll Settings", "number_of_holiday_shift"