Overridding a Shipping Method - What am I missing

Question

I\'ve written many many modules before but for some reason my shipping module won\'t override an exsiting Magneto shipping method. Is that allowed? What am I missing here?

Answer 1

Check first that the model is being overridden at all. Try this:

var_dump(get_class(Mage::getModel("shipping/carrier_tablerate")));