The “error” that the user sees in a section plane is not always really an error. It can simply be "condition". It is easier to understand the conditions established by the user himself: if, for example, he indicated that the plate cannot rotate because it contains veins, fibers or any texture, then even if a certain piece would fit in the same diagram if it were rotated, this would not be possible. Be done. Other conditions are established by the type of cutting tool: guillotines or cutters, among others, establish the condition that there are cuts from outside to outside on the sheet (guillotine cut), and that each cut also has at least least one cut like that. And even different models of machines can present their conditions, such as limits to the number of cutting phases; preventing the saw from passing partially outside the plate; initial cut, before starting to remove the pieces, to ensure that the sheet is square, etc.