Phiggs
think you need to re-define 'Empty'.... The galley will always have some food and water, the tanks will not be dry, and there may be hidden engineers lurking in the recesses.
Sorry, chum, but the galley, water and crew are all included in the empty weight, while the FMC knows the fuel amount and the nominal empty weight (APS weight). And if you think that a few engineers and loaders are going prevent the system from spotting an error of several tonnes, you need to send your engineers on a fitness course.
Meanwhile, KenV's absurd suggestion that the oleo torque links take the weight of the aircraft must take the 'aircraft anorak gibberish' award for 2015. Thanks, KenV, you have just confirmed that the closest you have got to an aircraft are the models on your mother's dressing table.