I wanted to use IE4n for refurbishment order but I don't know how does it work, did anybody knows how to do it, and what is the advantages of doing it?

To make it work:

1. You need to define in your material by MM02 the "serial no. profile" (Tab: Plant Data/Store. 2)
It can be a spart parts. (Or every type of material managed in stock). 

2. In spro: 
Plant Maintenance and Customer Service
> Maintenance and Service Processing
 > Configuration Control
   > Determine Properties of Notifications for Installing and 
Removing Parts
   > Make General Settings for Installation/Removal

And also : 
Plant Maintenance and Customer Service
 > Master Data in Plant Maintenance and Customer Service
  > Technical Objects
   > Serial Number Management (Used in MM02. Pt N°1)
   > Define Default Equipment Categories for Serial Numbers

3. After this, in the equipment IE02, Affect the material to your equipment and enter a serial number. The "stock information" appear and you can define your stock type (see F1), Plant, storage location, ...

4. IE4N allows you to install/Dismantle equipement with good Mvt.                        *-- Bakkali

Read also :-
Refurbishment Process In SAP PM

SAP Reference Books :-
SAP PM, CO, FI, PP, SD, MM, PS, QM, SM, HR, BW, APO, Basis,  ABAP/4, Certification, Books

Back to SAP PM :-
SAP PM (Plant Maintenance) Hints and Tips

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SAP ABAP/4 Programming, Basis Administration, Configuration Hints and Tips