why does my sw software apply a weight in the bom when a material has not been selected yet? This gave me and my client "big ones", when it placed an amount of weight much less than proper amount, into the bom. You would think if material is not selected at part level,... a arbitrary number would not be parametrically placed into the bom. It was overlooked, not double checked, and was a mistake and cost us big money. If it had correctly said zero, there would not have been a problem.
SW has a default density under document properties which is used to define the weight and other related values in case material is not defined.
You can set to any required value but not 0. But if you remove material from the model then it would revert back to the default value.