fix: Pro rata calculation is not working for WDV depreciation method
diff --git a/erpnext/assets/doctype/asset/asset.js b/erpnext/assets/doctype/asset/asset.js
index 2d78d26..c5cad73 100644
--- a/erpnext/assets/doctype/asset/asset.js
+++ b/erpnext/assets/doctype/asset/asset.js
@@ -303,14 +303,17 @@
 	},
 
 	set_depreciation_rate: function(frm, row) {
-		if (row.total_number_of_depreciations && row.frequency_of_depreciation) {
+		if (row.total_number_of_depreciations && row.frequency_of_depreciation
+			&& row.expected_value_after_useful_life) {
 			frappe.call({
 				method: "get_depreciation_rate",
 				doc: frm.doc,
 				args: row,
 				callback: function(r) {
 					if (r.message) {
-						frappe.model.set_value(row.doctype, row.name, "rate_of_depreciation", r.message);
+						frappe.flags.dont_change_rate = true;
+						frappe.model.set_value(row.doctype, row.name,
+							"rate_of_depreciation", flt(r.message, precision("rate_of_depreciation", row)));
 					}
 				}
 			});
@@ -338,6 +341,14 @@
 	total_number_of_depreciations: function(frm, cdt, cdn) {
 		const row = locals[cdt][cdn];
 		frm.events.set_depreciation_rate(frm, row);
+	},
+
+	rate_of_depreciation: function(frm, cdt, cdn) {
+		if(!frappe.flags.dont_change_rate) {
+			frappe.model.set_value(cdt, cdn, "expected_value_after_useful_life", 0);
+		}
+
+		frappe.flags.dont_change_rate = false;
 	}
 });
 
diff --git a/erpnext/assets/doctype/asset/asset.py b/erpnext/assets/doctype/asset/asset.py
index c398a73..6475d0c 100644
--- a/erpnext/assets/doctype/asset/asset.py
+++ b/erpnext/assets/doctype/asset/asset.py
@@ -101,7 +101,8 @@
 
 	def set_depreciation_rate(self):
 		for d in self.get("finance_books"):
-			d.rate_of_depreciation = self.get_depreciation_rate(d, on_validate=True)
+			d.rate_of_depreciation = flt(self.get_depreciation_rate(d, on_validate=True),
+				d.precision("rate_of_depreciation"))
 
 	def make_depreciation_schedule(self):
 		depreciation_method = [d.depreciation_method for d in self.finance_books]
@@ -110,8 +111,6 @@
 			self.schedules = []
 
 		if not self.get("schedules") and self.available_for_use_date:
-			total_depreciations = sum([d.total_number_of_depreciations for d in self.get('finance_books')])
-
 			for d in self.get('finance_books'):
 				self.validate_asset_finance_books(d)
 
@@ -124,74 +123,55 @@
 				end_date = add_months(d.depreciation_start_date,
 					no_of_depreciations * cint(d.frequency_of_depreciation))
 
-				total_days = date_diff(end_date, self.available_for_use_date)
-				rate_per_day = (value_after_depreciation - d.get("expected_value_after_useful_life")) / total_days
+				if d.depreciation_method in ("Straight Line", "Manual"):
+					total_days = date_diff(end_date, self.available_for_use_date)
+					rate_per_day = (value_after_depreciation - d.get("expected_value_after_useful_life")) / total_days
 
 				number_of_pending_depreciations = cint(d.total_number_of_depreciations) - \
 					cint(self.number_of_depreciations_booked)
 
 				from_date = self.available_for_use_date
 				if number_of_pending_depreciations:
-					next_depr_date = getdate(add_months(self.available_for_use_date,
-						number_of_pending_depreciations * 12))
-					if  (cint(frappe.db.get_value("Asset Settings", None, "schedule_based_on_fiscal_year")) == 1
-						and getdate(d.depreciation_start_date) < next_depr_date):
+					period_start_date = add_months(d.depreciation_start_date,
+						cint(d.frequency_of_depreciation) * -1)
 
-						number_of_pending_depreciations += 1
-						for n in range(number_of_pending_depreciations):
-							if n == list(range(number_of_pending_depreciations))[-1]:
-								schedule_date = add_months(self.available_for_use_date, n * 12)
-								previous_scheduled_date = add_months(d.depreciation_start_date, (n-1) * 12)
-								depreciation_amount = \
-									self.get_depreciation_amount_prorata_temporis(value_after_depreciation,
-										d, previous_scheduled_date, schedule_date)
+					for n in range(number_of_pending_depreciations):
+						schedule_date = add_months(d.depreciation_start_date,
+							n * cint(d.frequency_of_depreciation))
 
-							elif n == list(range(number_of_pending_depreciations))[0]:
-								schedule_date = d.depreciation_start_date
-								depreciation_amount = \
-									self.get_depreciation_amount_prorata_temporis(value_after_depreciation,
-										d, self.available_for_use_date, schedule_date)
+						days = date_diff(schedule_date, from_date)
 
-							else:
-								schedule_date = add_months(d.depreciation_start_date, n * 12)
-								depreciation_amount = \
-									 self.get_depreciation_amount_prorata_temporis(value_after_depreciation, d)
+						if n == 0: days += 1
 
-							if value_after_depreciation != 0:
-								value_after_depreciation -= flt(depreciation_amount)
+						if d.depreciation_method in ("Straight Line", "Manual"):
+							depreciation_amount = days * rate_per_day
+						else:
+							total_days = date_diff(schedule_date, period_start_date)
+							period_start_date = schedule_date
+							depreciation_amount = self.get_depreciation_amount(value_after_depreciation,
+								d.total_number_of_depreciations, d)
 
-								self.append("schedules", {
-									"schedule_date": schedule_date,
-									"depreciation_amount": depreciation_amount,
-									"depreciation_method": d.depreciation_method,
-									"finance_book": d.finance_book,
-									"finance_book_id": d.idx
-								})
-					else:
-						for n in range(number_of_pending_depreciations):
-							schedule_date = add_months(d.depreciation_start_date,
-								n * cint(d.frequency_of_depreciation))
+							depreciation_amount = flt((depreciation_amount * days) / total_days,
+								self.precision("gross_purchase_amount"))
 
-							if d.depreciation_method in ("Straight Line", "Manual"):
-								days = date_diff(schedule_date, from_date)
-								if n == 0: days += 1
+						from_date = schedule_date
 
-								depreciation_amount = days * rate_per_day
-								from_date = schedule_date
-							else:
-								depreciation_amount = self.get_depreciation_amount(value_after_depreciation,
-									d.total_number_of_depreciations, d)
+						if depreciation_amount:
+							value_after_depreciation -= flt(depreciation_amount,
+								self.precision("gross_purchase_amount"))
 
-							if depreciation_amount:
-								value_after_depreciation -= flt(depreciation_amount)
+							if (n == cint(number_of_pending_depreciations) - 1 and
+								d.expected_value_after_useful_life and
+								value_after_depreciation > d.expected_value_after_useful_life):
+								depreciation_amount += (value_after_depreciation - d.expected_value_after_useful_life)
 
-								self.append("schedules", {
-									"schedule_date": schedule_date,
-									"depreciation_amount": depreciation_amount,
-									"depreciation_method": d.depreciation_method,
-									"finance_book": d.finance_book,
-									"finance_book_id": d.idx
-								})
+							self.append("schedules", {
+								"schedule_date": schedule_date,
+								"depreciation_amount": depreciation_amount,
+								"depreciation_method": d.depreciation_method,
+								"finance_book": d.finance_book,
+								"finance_book_id": d.idx
+							})
 
 	def validate_asset_finance_books(self, row):
 		if flt(row.expected_value_after_useful_life) >= flt(self.gross_purchase_amount):
@@ -261,16 +241,8 @@
 		return flt(self.get('finance_books')[cint(idx)-1].value_after_depreciation)
 
 	def get_depreciation_amount(self, depreciable_value, total_number_of_depreciations, row):
-		if row.depreciation_method in ["Straight Line", "Manual"]:
-			amt = (flt(self.gross_purchase_amount) - flt(row.expected_value_after_useful_life) -
-				flt(self.opening_accumulated_depreciation))
-
-			depreciation_amount = amt * row.rate_of_depreciation
-		else:
-			depreciation_amount = flt(depreciable_value) * (flt(row.rate_of_depreciation) / 100)
-			value_after_depreciation = flt(depreciable_value) - depreciation_amount
-			if value_after_depreciation < flt(row.expected_value_after_useful_life):
-				depreciation_amount = flt(depreciable_value) - flt(row.expected_value_after_useful_life)
+		precision = self.precision("gross_purchase_amount")
+		depreciation_amount = flt(depreciable_value * (flt(row.rate_of_depreciation) / 100), precision)
 
 		return depreciation_amount
 
@@ -301,9 +273,12 @@
 					flt(accumulated_depreciation_after_full_schedule),
 					self.precision('gross_purchase_amount'))
 
-				if row.expected_value_after_useful_life < asset_value_after_full_schedule:
+				if (row.expected_value_after_useful_life and 
+					row.expected_value_after_useful_life < asset_value_after_full_schedule):
 					frappe.throw(_("Depreciation Row {0}: Expected value after useful life must be greater than or equal to {1}")
 						.format(row.idx, asset_value_after_full_schedule))
+				elif not row.expected_value_after_useful_life:
+					row.expected_value_after_useful_life = asset_value_after_full_schedule
 
 	def validate_cancellation(self):
 		if self.status not in ("Submitted", "Partially Depreciated", "Fully Depreciated"):
diff --git a/erpnext/assets/doctype/asset_settings/asset_settings.json b/erpnext/assets/doctype/asset_settings/asset_settings.json
index a3fee96..edc5ce1 100644
--- a/erpnext/assets/doctype/asset_settings/asset_settings.json
+++ b/erpnext/assets/doctype/asset_settings/asset_settings.json
@@ -54,75 +54,6 @@
    "collapsible": 0, 
    "columns": 0, 
    "fetch_if_empty": 0, 
-   "fieldname": "schedule_based_on_fiscal_year", 
-   "fieldtype": "Check", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Calculate Prorated Depreciation Schedule Based on Fiscal Year", 
-   "length": 0, 
-   "no_copy": 0, 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 0, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "translatable": 0, 
-   "unique": 0
-  }, 
-  {
-   "allow_bulk_edit": 0, 
-   "allow_in_quick_entry": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "default": "360", 
-   "depends_on": "eval:doc.schedule_based_on_fiscal_year", 
-   "description": "This value is used for pro-rata temporis calculation", 
-   "fetch_if_empty": 0, 
-   "fieldname": "number_of_days_in_fiscal_year", 
-   "fieldtype": "Data", 
-   "hidden": 0, 
-   "ignore_user_permissions": 0, 
-   "ignore_xss_filter": 0, 
-   "in_filter": 0, 
-   "in_global_search": 0, 
-   "in_list_view": 0, 
-   "in_standard_filter": 0, 
-   "label": "Number of Days in Fiscal Year", 
-   "length": 0, 
-   "no_copy": 0, 
-   "permlevel": 0, 
-   "precision": "", 
-   "print_hide": 0, 
-   "print_hide_if_no_value": 0, 
-   "read_only": 0, 
-   "remember_last_selected_value": 0, 
-   "report_hide": 0, 
-   "reqd": 0, 
-   "search_index": 0, 
-   "set_only_once": 0, 
-   "translatable": 0, 
-   "unique": 0
-  }, 
-  {
-   "allow_bulk_edit": 0, 
-   "allow_in_quick_entry": 0, 
-   "allow_on_submit": 0, 
-   "bold": 0, 
-   "collapsible": 0, 
-   "columns": 0, 
-   "fetch_if_empty": 0, 
    "fieldname": "disable_cwip_accounting", 
    "fieldtype": "Check", 
    "hidden": 0, 
@@ -159,7 +90,7 @@
  "issingle": 1, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2019-03-08 10:44:41.924547", 
+ "modified": "2019-05-26 18:31:19.930563", 
  "modified_by": "Administrator", 
  "module": "Assets", 
  "name": "Asset Settings",