What triggers the error message "invalid multiplier" in SAINT Classification import?

I'm trying to import a numeric classification, but I'm unable to get past the warning:

• Warning: Invalid Multiplier: '1'

This appears whenever I populate the final two columns with anything (the '1' part is because I tried filling the final column with 1's on the last go).

In the example below, "Amt" is the classification variable of type 'text', and then "Amt^~AmtN" is the 'numeric' classification variable.

I presume the variable ending "~per~" is meant to be the type of 'numeric' (it never changes, regardless of whether I select "percent", "number", or "currency").

1. What does the error mean?
2. What should go in "Amt" and its sub-classifications?