I have a building construction project.

My project started several months ago.

So, I have real costs on it.

Now my customer wants to change lamps in a room.

So, I have to remove the lamps currently planed and adding new lamps. For that, I have to send it a new quotation and after his validation, modify my project (remove the lamps n°1 and add lamps N°2)

Of course, il have to retreive on my project that the lamps n°1 have a negative quantity and that i need now lamps n°2. 

What is the good way in IFS ? is SOW the good way ? which way do you think is the good ?

My version : 23R1