Hi, magnemoe, thank you for the answer.
Unfortunately, that don't work in my case. Maybe is because my harvester was made before the contract sign ( although the contract does not specify that) or was made in an earlier version and, for some reason, the game wont recognise that the ore is the same fresh ore (from the mun in my case).
I have tried any thing you can imagine to tag this contract. The next step should be sent a new expensive harvester to the mun an see what happens.
Sorry for my terrible google english.