Your comments

Hello
Can one improve "CONTRATS" and "COSTS" to have for example
Contrat "Marche d' achat matériel"
Cost:

prize(lot) 1 Inverter ,date beginning, date end , guaranteed ( 36 Months), alert(notify) (at end / advance notice), cost, .
Cost: the Lot(Prize) 2 Computer date beginning, date end , guaranteed ( 12 Months), alert(notify) , cost , supplier ..