In the properties, you can edit the volume mass. For the same volume, the weight is different if it is made out of steel, aluminium, copper or any other materials you can work with. Now it is possible to Edit a negativ mass weigth. If you create a negative mass it will not be corected. The CAD will then calculates with the total values of an assembly. The sum will decrease. This is a source for failer. For the Users, when they edit properties, no negative values are allowed in the input field of the mass.
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