Adding a fixed term contract

Hello,

While managing fixed term contracts, we have the following issue :

In some cases, the manager has to add a contract for an employee having already a contract beginning later in the system. Example:

Contract 1: 01.01.2011 to 31.01.2011

Contract 3: from 01.03.2011 to 31.03.2011

The need is to manage the contract 2 from 01.02.2011 to 28.02.2011

Extreme case: the contract 3 is the first contract of the employee in the system (hiring and registration).

Have you ever had this type of subject? What are the impacts on the payroll? Any information or document would be welcome.

Best Regards,

K.