Thanks for your interest, very kind.
Unfortunately, the discounts are not always the same and change from negotiation to negotiation. It is also capable that an extra discount will be granted at the end of work.
It would be useful to have 3 boxes available where to insert the various multipliers.
I tried to get my brother to do it and he succeeded in the edit view but then the data is not saved and consequently they are not shown in the detail view nor can they be recalled.
Is it possible that in addition to the two files it is also necessary to modify the DB?