Project Users role not required to add user to the project

erpnext/projects/doctype/project/project.js

@@ -22,6 +22,12 @@ frappe.ui.form.on("Project", {
 		}
 
 		frm.set_query('customer', 'erpnext.controllers.queries.customer_query');
+		
+		frm.set_query("user", "users", function() {
+					return {
+						query:"erpnext.projects.doctype.project.project.get_users_for_project"
+					}
+				});
 
 		// sales order
 		frm.set_query('sales_order', function() {

erpnext/projects/doctype/project/project.py

@@ -187,6 +187,13 @@ def get_list_context(context=None):
 		"row_template": "templates/includes/projects/project_row.html"
 	}
 
+def get_users_for_project(doctype, txt, searchfield, start, page_len, filters):	
+	return frappe.db.sql("""select name, concat_ws(' ', first_name, middle_name, last_name)
+		from `tabUser` 
+		where enabled=1 
+		and name not in ("Guest", "Administrator")
+		order by 
+		name asc""")
 
 @frappe.whitelist()
 def get_cost_center_name(project):