diff --git a/erpnext/support/doctype/maintenance_visit/maintenance_visit.py b/erpnext/support/doctype/maintenance_visit/maintenance_visit.py
index 5175ca9..89fc2f0 100644
--- a/erpnext/support/doctype/maintenance_visit/maintenance_visit.py
+++ b/erpnext/support/doctype/maintenance_visit/maintenance_visit.py
@@ -136,6 +136,7 @@
 
 	def check_if_last_visit(self):
 		"""check if last maintenance visit against same sales order/ customer issue"""
+		check_for_docname = check_for_doctype = None
 		for d in getlist(self.doclist, 'maintenance_visit_details'):
 			if d.prevdoc_docname:
 				check_for_docname = d.prevdoc_docname
diff --git a/public/js/all-app.js b/public/js/all-app.js
index 7fef076..dc2904e 100644
--- a/public/js/all-app.js
+++ b/public/js/all-app.js
@@ -656,7 +656,7 @@
 if(!this.df.permlevel)this.df.permlevel=0;var p=this.perm[this.df.permlevel];var ret;if(cur_frm.editable&&p&&p[WRITE]&&!this.df.disabled)ret='Write';else if(p&&p[READ])ret='Read';else ret='None';if(this.df.fieldtype=='Binary')
 ret='None';if(cint(this.df.hidden))
 ret='None';if(ret=='Write'&&cint(cur_frm.doc.docstatus)>0)ret='Read';var a_o_s=cint(this.df.allow_on_submit);if(a_o_s&&(this.in_grid||(this.frm&&this.frm.not_in_container))){a_o_s=null;if(this.in_grid)a_o_s=this.grid.field.df.allow_on_submit;if(this.frm&&this.frm.not_in_container){a_o_s=cur_grid.field.df.allow_on_submit;}}
-if(cur_frm.editable&&a_o_s&&cint(cur_frm.doc.docstatus)>0&&!this.df.hidden){tmp_perm=get_perm(cur_frm.doctype,cur_frm.docname,1);if(tmp_perm[this.df.permlevel]&&tmp_perm[this.df.permlevel][WRITE])ret='Write';}
+if(cur_frm.editable&&a_o_s&&cint(cur_frm.doc.docstatus)>0&&!this.df.hidden){tmp_perm=get_perm(cur_frm.doctype,cur_frm.docname,1);if(tmp_perm[this.df.permlevel]&&tmp_perm[this.df.permlevel][WRITE]){ret='Write';}}
 return ret;}
 Field.prototype.set_style_mandatory=function(add){if(add){$(this.txt?this.txt:this.input).addClass('input-mandatory');if(this.disp_area)$(this.disp_area).addClass('input-mandatory');}else{$(this.txt?this.txt:this.input).removeClass('input-mandatory');if(this.disp_area)$(this.disp_area).removeClass('input-mandatory');}}
 Field.prototype.refresh_mandatory=function(){if(this.in_filter)return;if(this.df.reqd){if(this.label_area)this.label_area.style.color="#d22";this.set_style_mandatory(1);}else{if(this.label_area)this.label_area.style.color="#222";this.set_style_mandatory(0);}
@@ -727,7 +727,7 @@
 var t=v.split('-');if(t.length!=3){return this.clear();}
 else if(cint(t[1])>12||cint(t[1])<1){return this.clear();}
 else if(cint(t[2])>31||cint(t[2])<1){return this.clear();}
-return v;};function LinkField(){}LinkField.prototype=new Field();LinkField.prototype.make_input=function(){var me=this;if(me.df.no_buttons){this.txt=$a(this.input_area,'input');this.input=this.txt;}else{makeinput_popup(this,'icon-search','icon-play','icon-plus');me.setup_buttons();me.onrefresh=function(){if(me.can_create&&cur_frm.doc.docstatus==0)
+return v;};function LinkField(){}LinkField.prototype=new Field();LinkField.prototype.make_input=function(){var me=this;if(me.df.no_buttons){this.txt=$a(this.input_area,'input');this.input=this.txt;}else{makeinput_popup(this,'icon-search','icon-play','icon-plus');me.setup_buttons();me.onrefresh=function(){if(me.can_create)
 $(me.btn2).css('display','inline-block');else $dh(me.btn2);}}
 me.txt.field_object=this;me.input.set_input=function(val){if(val==undefined)val='';me.txt.value=val;}
 me.get_value=function(){return me.txt.value;}
@@ -1532,7 +1532,7 @@
 if(!this.df.permlevel)this.df.permlevel=0;var p=this.perm[this.df.permlevel];var ret;if(cur_frm.editable&&p&&p[WRITE]&&!this.df.disabled)ret='Write';else if(p&&p[READ])ret='Read';else ret='None';if(this.df.fieldtype=='Binary')
 ret='None';if(cint(this.df.hidden))
 ret='None';if(ret=='Write'&&cint(cur_frm.doc.docstatus)>0)ret='Read';var a_o_s=cint(this.df.allow_on_submit);if(a_o_s&&(this.in_grid||(this.frm&&this.frm.not_in_container))){a_o_s=null;if(this.in_grid)a_o_s=this.grid.field.df.allow_on_submit;if(this.frm&&this.frm.not_in_container){a_o_s=cur_grid.field.df.allow_on_submit;}}
-if(cur_frm.editable&&a_o_s&&cint(cur_frm.doc.docstatus)>0&&!this.df.hidden){tmp_perm=get_perm(cur_frm.doctype,cur_frm.docname,1);if(tmp_perm[this.df.permlevel]&&tmp_perm[this.df.permlevel][WRITE])ret='Write';}
+if(cur_frm.editable&&a_o_s&&cint(cur_frm.doc.docstatus)>0&&!this.df.hidden){tmp_perm=get_perm(cur_frm.doctype,cur_frm.docname,1);if(tmp_perm[this.df.permlevel]&&tmp_perm[this.df.permlevel][WRITE]){ret='Write';}}
 return ret;}
 Field.prototype.set_style_mandatory=function(add){if(add){$(this.txt?this.txt:this.input).addClass('input-mandatory');if(this.disp_area)$(this.disp_area).addClass('input-mandatory');}else{$(this.txt?this.txt:this.input).removeClass('input-mandatory');if(this.disp_area)$(this.disp_area).removeClass('input-mandatory');}}
 Field.prototype.refresh_mandatory=function(){if(this.in_filter)return;if(this.df.reqd){if(this.label_area)this.label_area.style.color="#d22";this.set_style_mandatory(1);}else{if(this.label_area)this.label_area.style.color="#222";this.set_style_mandatory(0);}
@@ -1603,7 +1603,7 @@
 var t=v.split('-');if(t.length!=3){return this.clear();}
 else if(cint(t[1])>12||cint(t[1])<1){return this.clear();}
 else if(cint(t[2])>31||cint(t[2])<1){return this.clear();}
-return v;};function LinkField(){}LinkField.prototype=new Field();LinkField.prototype.make_input=function(){var me=this;if(me.df.no_buttons){this.txt=$a(this.input_area,'input');this.input=this.txt;}else{makeinput_popup(this,'icon-search','icon-play','icon-plus');me.setup_buttons();me.onrefresh=function(){if(me.can_create&&cur_frm.doc.docstatus==0)
+return v;};function LinkField(){}LinkField.prototype=new Field();LinkField.prototype.make_input=function(){var me=this;if(me.df.no_buttons){this.txt=$a(this.input_area,'input');this.input=this.txt;}else{makeinput_popup(this,'icon-search','icon-play','icon-plus');me.setup_buttons();me.onrefresh=function(){if(me.can_create)
 $(me.btn2).css('display','inline-block');else $dh(me.btn2);}}
 me.txt.field_object=this;me.input.set_input=function(val){if(val==undefined)val='';me.txt.value=val;}
 me.get_value=function(){return me.txt.value;}
diff --git a/public/js/fields.js b/public/js/fields.js
index 8fee106..7d00562 100644
--- a/public/js/fields.js
+++ b/public/js/fields.js
@@ -23,7 +23,7 @@
 if(!this.df.permlevel)this.df.permlevel=0;var p=this.perm[this.df.permlevel];var ret;if(cur_frm.editable&&p&&p[WRITE]&&!this.df.disabled)ret='Write';else if(p&&p[READ])ret='Read';else ret='None';if(this.df.fieldtype=='Binary')
 ret='None';if(cint(this.df.hidden))
 ret='None';if(ret=='Write'&&cint(cur_frm.doc.docstatus)>0)ret='Read';var a_o_s=cint(this.df.allow_on_submit);if(a_o_s&&(this.in_grid||(this.frm&&this.frm.not_in_container))){a_o_s=null;if(this.in_grid)a_o_s=this.grid.field.df.allow_on_submit;if(this.frm&&this.frm.not_in_container){a_o_s=cur_grid.field.df.allow_on_submit;}}
-if(cur_frm.editable&&a_o_s&&cint(cur_frm.doc.docstatus)>0&&!this.df.hidden){tmp_perm=get_perm(cur_frm.doctype,cur_frm.docname,1);if(tmp_perm[this.df.permlevel]&&tmp_perm[this.df.permlevel][WRITE])ret='Write';}
+if(cur_frm.editable&&a_o_s&&cint(cur_frm.doc.docstatus)>0&&!this.df.hidden){tmp_perm=get_perm(cur_frm.doctype,cur_frm.docname,1);if(tmp_perm[this.df.permlevel]&&tmp_perm[this.df.permlevel][WRITE]){ret='Write';}}
 return ret;}
 Field.prototype.set_style_mandatory=function(add){if(add){$(this.txt?this.txt:this.input).addClass('input-mandatory');if(this.disp_area)$(this.disp_area).addClass('input-mandatory');}else{$(this.txt?this.txt:this.input).removeClass('input-mandatory');if(this.disp_area)$(this.disp_area).removeClass('input-mandatory');}}
 Field.prototype.refresh_mandatory=function(){if(this.in_filter)return;if(this.df.reqd){if(this.label_area)this.label_area.style.color="#d22";this.set_style_mandatory(1);}else{if(this.label_area)this.label_area.style.color="#222";this.set_style_mandatory(0);}
@@ -94,7 +94,7 @@
 var t=v.split('-');if(t.length!=3){return this.clear();}
 else if(cint(t[1])>12||cint(t[1])<1){return this.clear();}
 else if(cint(t[2])>31||cint(t[2])<1){return this.clear();}
-return v;};function LinkField(){}LinkField.prototype=new Field();LinkField.prototype.make_input=function(){var me=this;if(me.df.no_buttons){this.txt=$a(this.input_area,'input');this.input=this.txt;}else{makeinput_popup(this,'icon-search','icon-play','icon-plus');me.setup_buttons();me.onrefresh=function(){if(me.can_create&&cur_frm.doc.docstatus==0)
+return v;};function LinkField(){}LinkField.prototype=new Field();LinkField.prototype.make_input=function(){var me=this;if(me.df.no_buttons){this.txt=$a(this.input_area,'input');this.input=this.txt;}else{makeinput_popup(this,'icon-search','icon-play','icon-plus');me.setup_buttons();me.onrefresh=function(){if(me.can_create)
 $(me.btn2).css('display','inline-block');else $dh(me.btn2);}}
 me.txt.field_object=this;me.input.set_input=function(val){if(val==undefined)val='';me.txt.value=val;}
 me.get_value=function(){return me.txt.value;}