The Numeric formatter turns a number as written in the document into a plain number: no currency symbols, no spaces, no thousand separators, and . as the decimal separator.
Options
How values are read
Anything that is not a digit, separator or minus sign is removed first, so currency codes, symbols and stray text do not matter. A minus sign is kept only at the start.
When a value contains both . and ,, the last one is the decimal separator:
Ambiguous separators
When only one separator is present it may be either a decimal or a thousand separator. The formatter guesses from the digit grouping: a separator followed by exactly three digits is read as a thousand separator.
The default is the right guess for 1.234 meaning one thousand two hundred and thirty-four, and the wrong one for a value with three decimals such as 1234.567. If your documents have three-decimal numbers — unit prices, weights, exchange rates — set Decimal separator on ambiguity to the separator your documents actually use.
When it fails
If the value cannot be read as a number at all, the field is cleared and the formatter reports Unable to parse <value> as a number. The document then goes to human review. An empty value is left empty without an error.