HELP Selecting billing type for new carrier

[salgueirone]

Hello,

 

I have a running shop using PS 1.3.1,with one carrier to deliver in home city, that uses price range as billing type.

 

Now i was trying to set up a new carrier, to use weight ranges as billing type.

The problem is that in my BackOffice I cannot do that selection, as i've seen in others.

 

 

Is that a version issue? It is not available in 1.3.1? Can it be done modifying the files?

 

I leave a print of what i mean.

On the left is my actual BO. On the right is the change wanted.

 

Can anybody help me, please?

 

 

Thanks in advance.