Link between mseg and vekp or vepo

Hi guys, i need to know relation between table mseg and vekp or vepo for find Number HU.

I just make a report between material and sd.

But i didn't know the relation between mseg and vekp or vepo.

for eg tcode mb51.

There is a information about the handling unit, but i don't know the relation with the table mseg.

I know the HU number in table vekp.

Please help.

Thanks and regard