For example a couple of weeks back I met a customer from the chemical industry who is planning to divest some of their divisions but continue to be the information technology provider for all those divested divisions. At the same time they did not want to start an SAP ERP HCM implementation project for those divested divisions.That would be expensive, time consuming and risky. The Side-by-Side HCM deployment model suits the needs of such customers too.
This is not something we recommend for all customers. Customer needs and current landscapes need to be carefully studied before recommending this deployment model to a customer.
The first packaged integration that supports this deployment model was released as part of the August 2014 release. The configuration document is now available in service market place.
There are a number of design boundaries that the implementation team needs to be aware of. If you a colleague recommending the Side-by-Side deployment model to a customer or a customer considering the Side-by-Side HCM deployment model, I urge you to read the document and understand the possibilities and limitations. This document is the most authentic source of information.