Hi ideasman,
Well, the number is a part of a horse's name on BetFair, just like an apostrophe or hyphen. When a trigger checks if a name is equal to the entries in the file, it looks for an exact case-insensitive match.
You could try the "Import selections for auto-trading" though - it looks for names with and without numbers, dots etc., so it is more flexible. But this will only work if you can let the trigger ignore all other selections.