section 144 of company's act 2013

Sec 144 relates to restrict the work of statutory auditor.
If an auditor appoint in particular company as statutory auditor as per sec 139 then he shouldn't provide service specify in the sec 144 to same company or its holding company or its subsidiary company .
List of the service are as under
(a) accounting and book keeping services;

(b) internal audit;

(c) design and implementation of any financial information system;

(d) actuarial services;

(e) investment advisory services;

(f) investment banking services;

(g) rendering of outsourced financial services;

(h) management services; and

(i) any other kind of services as may be prescribed:

design and implementation of any financial information system; please explain

Its include following services.
1.Installation & implementation of financial accounting system
2.Inventory management
3.Costing & Budgeting
4.identification of appropriate software for accounting and internal control system
5.service related to internal control documentation

rendering of outsourced financial services;

(h) management services;

Its outsourcing service. Many chartered accountant firm provides this kind of service where own work get done by third party.
E.g firm getting accounting work from their client and out source same to any other party who will complete this work.
Reasons is that to get benefit like
1. Free from purchasing costlier software
2.time saving
3.avoid to appoint extra staff & employees
By this way we can effectively concentrate and provide extra time for other important matters.