feat: initialize party link for customer & suppliers

erpnext/accounts/doctype/party_link/party_link.js

@@ -0,0 +1,41 @@
+// Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Party Link', {
+	refresh: function(frm) {
+		frm.set_query('party_type', 'links', () => {
+			return {
+				filters: {
+					name: ['in', party_types]
+				}
+			};
+		});
+
+		frm.set_query('primary_role', () => {
+			return {
+				filters: {
+					name: ['in', ['Customer', 'Supplier']]
+				}
+			};
+		});
+
+		frm.set_query('secondary_role', () => {
+			let party_types = Object.keys(frappe.boot.party_account_types)
+				.filter(p => p != frm.doc.primary_role);
+			return {
+				filters: {
+					name: ['in', party_types]
+				}
+			};
+		});
+	},
+
+	primary_role(frm) {
+		frm.set_value('primary_party', '');
+		frm.set_value('secondary_role', '');
+	},
+
+	secondary_role(frm) {
+		frm.set_value('secondary_party', '');
+	}
+});

erpnext/accounts/doctype/party_link/party_link.json

@@ -0,0 +1,78 @@
+{
+ "actions": [],
+ "autoname": "ACC-PT-LNK-.###.",
+ "creation": "2021-08-18 21:06:53.027695",
+ "doctype": "DocType",
+ "editable_grid": 1,
+ "engine": "InnoDB",
+ "field_order": [
+  "primary_role",
+  "secondary_role",
+  "column_break_2",
+  "primary_party",
+  "secondary_party"
+ ],
+ "fields": [
+  {
+   "fieldname": "primary_role",
+   "fieldtype": "Link",
+   "in_list_view": 1,
+   "label": "Primary Role",
+   "options": "DocType",
+   "reqd": 1
+  },
+  {
+   "fieldname": "column_break_2",
+   "fieldtype": "Column Break"
+  },
+  {
+   "depends_on": "primary_role",
+   "fieldname": "secondary_role",
+   "fieldtype": "Link",
+   "label": "Secondary Role",
+   "mandatory_depends_on": "primary_role",
+   "options": "DocType"
+  },
+  {
+   "depends_on": "primary_role",
+   "fieldname": "primary_party",
+   "fieldtype": "Dynamic Link",
+   "label": "Primary Party",
+   "mandatory_depends_on": "primary_role",
+   "options": "primary_role"
+  },
+  {
+   "depends_on": "secondary_role",
+   "fieldname": "secondary_party",
+   "fieldtype": "Dynamic Link",
+   "label": "Secondary Party",
+   "mandatory_depends_on": "secondary_role",
+   "options": "secondary_role"
+  }
+ ],
+ "index_web_pages_for_search": 1,
+ "links": [],
+ "modified": "2021-08-19 17:53:43.456752",
+ "modified_by": "Administrator",
+ "module": "Accounts",
+ "name": "Party Link",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "sort_field": "modified",
+ "sort_order": "DESC",
+ "title_field": "primary_party",
+ "track_changes": 1
+}

erpnext/accounts/doctype/party_link/party_link.py

@@ -0,0 +1,12 @@
+# Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and contributors
+# For license information, please see license.txt
+
+import frappe
+from frappe import _
+from frappe.model.document import Document
+
+class PartyLink(Document):
+	def validate(self):
+		if self.primary_role not in ['Customer', 'Supplier']:
+			frappe.throw(_("Allowed primary roles are 'Customer' and 'Supplier'. Please select one of these roles only."),
+				title=_("Invalid Primary Role"))

erpnext/accounts/doctype/party_link/test_party_link.py

@@ -0,0 +1,8 @@
+# Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and Contributors
+# See license.txt
+
+# import frappe
+import unittest
+
+class TestPartyLink(unittest.TestCase):
+	pass