feat(Contacts): select billing contact for sales invoice
diff --git a/erpnext/erpnext_integrations/custom/contact.json b/erpnext/erpnext_integrations/custom/contact.json
new file mode 100644
index 0000000..98a4bbc
--- /dev/null
+++ b/erpnext/erpnext_integrations/custom/contact.json
@@ -0,0 +1,60 @@
+{
+ "custom_fields": [
+  {
+   "_assign": null,
+   "_comments": null,
+   "_liked_by": null,
+   "_user_tags": null,
+   "allow_on_submit": 0,
+   "bold": 0,
+   "collapsible": 0,
+   "collapsible_depends_on": null,
+   "columns": 0,
+   "creation": "2019-12-02 11:00:03.432994",
+   "default": null,
+   "depends_on": null,
+   "description": null,
+   "docstatus": 0,
+   "dt": "Contact",
+   "fetch_from": null,
+   "fetch_if_empty": 0,
+   "fieldname": "is_billing_contact",
+   "fieldtype": "Check",
+   "hidden": 0,
+   "idx": 27,
+   "ignore_user_permissions": 0,
+   "ignore_xss_filter": 0,
+   "in_global_search": 0,
+   "in_list_view": 0,
+   "in_standard_filter": 0,
+   "insert_after": "is_primary_contact",
+   "label": "Is Billing Contact",
+   "length": 0,
+   "modified": "2019-12-02 11:00:03.432994",
+   "modified_by": "Administrator",
+   "name": "Contact-is_billing_contact",
+   "no_copy": 0,
+   "options": null,
+   "owner": "Administrator",
+   "parent": null,
+   "parentfield": null,
+   "parenttype": null,
+   "permlevel": 0,
+   "precision": "",
+   "print_hide": 0,
+   "print_hide_if_no_value": 0,
+   "print_width": null,
+   "read_only": 0,
+   "report_hide": 0,
+   "reqd": 0,
+   "search_index": 0,
+   "translatable": 0,
+   "unique": 0,
+   "width": null
+  }
+ ],
+ "custom_perms": [],
+ "doctype": "Contact",
+ "property_setters": [],
+ "sync_on_migrate": 1
+}
\ No newline at end of file