sample unit of measurement

Hi gurus,

I have assigned sampling procedure to my mic's in inspection plan.In that we have defined sampling unit of measure as Kg and sample size 1.

Base unit of measure of manufactured material is metric tonne(MT).

While doing UD in inspection lot stock tab, system shows sample unit of measure as MT while i have defined unit of measure Kg in master inspection characteristic.

What should be reason behind system showing unit of measure MT instead of Kg.

regards