erpnext/regional/germany/setup.py

import frappe
from frappe.custom.doctype.custom_field.custom_field import create_custom_fields


def setup(company=None, patch=True):
	make_custom_fields()
	add_custom_roles_for_reports()


def make_custom_fields():
	custom_fields = {
		'Party Account': [
			dict(fieldname='debtor_creditor_number', label='Debtor/Creditor Number',
			fieldtype='Data', insert_after='account', translatable=0)
		]
	}

	create_custom_fields(custom_fields)


def add_custom_roles_for_reports():
	"""Add Access Control to UAE VAT 201."""
	if not frappe.db.get_value('Custom Role', dict(report='DATEV')):
		frappe.get_doc(dict(
			doctype='Custom Role',
			report='DATEV',
			roles= [
				dict(role='Accounts User'),
				dict(role='Accounts Manager')
			]
		)).insert()