Error translating the quantity to the CO-PA standard quantity

Hi people,

We have the follow problem:

"Customizing in Profitability Analysis CO-PA allows a standard quantity
field to be updated.

An error has occurred in the present document while the standard
quantity field "VVQ02" was being supplied.

The base unit of measure "ST" could not be translated into the standard
unit of measure "TO" for the material "2021489"."

Obs.: We can´t update unit of measure in the material master data and we can erase the line in the transacction: KE4MS

We already know some disction here and one of them says us to go to the exit COPA0005.

How to do that?

Thanks

RN