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

If anyone else is facing this problem and came here for solution, it looks like OP have used codepool in module file where it should be codePool (notice the capital P).