erpnext/buying/__init__.py

install_docs = [
	{"doctype":"Role", "role_name":"Purchase Manager", "name":"Purchase Manager"},
	{"doctype":"Role", "role_name":"Purchase User", "name":"Purchase User"},
	{"doctype":"Role", "role_name":"Purchase Master Manager", "name":"Purchase Master Manager"},
	{"doctype":"Role", "role_name":"Supplier", "name":"Supplier"}	
]