Updated cost of the resources into project with the informations of the order

hi,
I use projeqtor since a few time and i have a question on the update cost of ressources in the project with information of the order.

From the order (table and file php is "command") when you save it, how is made the update the informations of fileds work and amount towards the project ?, which is or are the files and fonctions which are used ? (to see in the project, the table update is planningelement with "reftype" is project, and updated fileds are "valitedwork", "valitedcost" and "totalvalitedcost")

Thank a lot