diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
index b3b35f9745..f83528cb6d 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.js
@@ -176,6 +176,10 @@ erpnext.accounts.SalesInvoiceController = erpnext.selling.SellingController.exte
 			this.frm.set_value("write_off_amount",
 				flt(this.frm.doc.base_grand_total - this.frm.doc.paid_amount, precision("write_off_amount"))
 			);
+			this.frm.toggle_enable("write_off_amount", false);
+
+		} else {
+			this.frm.toggle_enable("write_off_amount", true);
 		}
 
 		this.calculate_outstanding_amount(false);
@@ -219,10 +223,8 @@ cur_frm.cscript.hide_fields = function(doc) {
 
 	if(cint(doc.is_pos) == 1) {
 		hide_field(par_flds);
-		unhide_field('payments_section');
 		cur_frm.fields_dict['items'].grid.set_column_disp(item_flds_normal, false);
 	} else {
-		hide_field('payments_section');
 		for (i in par_flds) {
 			var docfield = frappe.meta.docfield_map[doc.doctype][par_flds[i]];
 			if(!docfield.hidden) unhide_field(par_flds[i]);
@@ -238,6 +240,8 @@ cur_frm.cscript.hide_fields = function(doc) {
 	if (frappe.boot.sysdefaults.country == 'India') unhide_field(['c_form_applicable', 'c_form_no']);
 	else hide_field(['c_form_applicable', 'c_form_no']);
 
+	this.frm.toggle_enable("write_off_amount", !!!cint(doc.write_off_outstanding_amount_automatically));
+
 	cur_frm.refresh_fields();
 }
 
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.json b/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
index bb9f08f1f5..70e79b05b3 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
@@ -654,7 +654,7 @@
    "read_only": 0
   }, 
   {
-   "depends_on": "is_pos", 
+   "depends_on": "eval:doc.is_pos===1||(doc.advances && doc.advances.length>0)", 
    "fieldname": "payments_section", 
    "fieldtype": "Section Break", 
    "label": "Payments", 
@@ -696,7 +696,7 @@
    "read_only": 0
   }, 
   {
-   "depends_on": "is_pos", 
+   "depends_on": "eval:doc.is_pos===1||(doc.advances && doc.advances.length>0)", 
    "fieldname": "column_break4", 
    "fieldtype": "Column Break", 
    "permlevel": 0, 
@@ -704,7 +704,7 @@
    "width": "50%"
   }, 
   {
-   "depends_on": "is_pos", 
+   "depends_on": "eval:doc.is_pos===1||(doc.advances && doc.advances.length>0)", 
    "fieldname": "write_off_outstanding_amount_automatically", 
    "fieldtype": "Check", 
    "label": "Write Off Outstanding Amount", 
@@ -713,7 +713,7 @@
    "read_only": 0
   }, 
   {
-   "depends_on": "is_pos", 
+   "depends_on": "eval:doc.is_pos===1||(doc.advances && doc.advances.length>0)", 
    "fieldname": "write_off_amount", 
    "fieldtype": "Currency", 
    "label": "Write Off Amount", 
@@ -724,7 +724,7 @@
    "read_only": 0
   }, 
   {
-   "depends_on": "is_pos", 
+   "depends_on": "eval:doc.is_pos===1||(doc.advances && doc.advances.length>0)", 
    "fieldname": "write_off_account", 
    "fieldtype": "Link", 
    "label": "Write Off Account", 
@@ -734,7 +734,7 @@
    "read_only": 0
   }, 
   {
-   "depends_on": "is_pos", 
+   "depends_on": "eval:doc.is_pos===1||(doc.advances && doc.advances.length>0)", 
    "fieldname": "write_off_cost_center", 
    "fieldtype": "Link", 
    "label": "Write Off Cost Center", 
@@ -1246,7 +1246,7 @@
  "icon": "icon-file-text", 
  "idx": 1, 
  "is_submittable": 1, 
- "modified": "2015-03-23 14:46:49.412013", 
+ "modified": "2015-04-01 06:50:49.748285", 
  "modified_by": "Administrator", 
  "module": "Accounts", 
  "name": "Sales Invoice",