Copying field (Processing 0 comics)

[alfablac]

I'm trying to copy the number field to a text based field.
Tried {Number} as the value, but the process doesn't complete.
Windows 10 x64 Python 2.7 latest versions of Comic Rack and Data Manager 2.04.05. r785

Code from dat is simple:

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<collection name="xx" comment="xx" version="2.4.5">
  <group name="xx">
    <filtersanddefaults rulesetmode="AND" />
    <ruleset name="MOVE" rulesetmode="AND">
      <rule field="Number" modifier="Less" value="100" />
      <action field="BookNotes" modifier="SetValue" value="{Number}" />
    </ruleset>
  </group>
  <disabled name="Disabled" comment="Disabled Groups and Rulesets">
    <filtersanddefaults rulesetmode="AND" />
  </disabled>
</collection>

That's the problematic line:
<action field="BookNotes" modifier="SetValue" value="{Number}" />

If I set it just Number (the value "Number"), for example, the fields are filled with Number,
so I guess it's or something on my end that needs some update, but I have no clue. Didn't find a log to check what the problem is.