A numeric attribute has a format defined as 0,0 so that there is a thousands separator (12,557). When attribute is used in a tag for a document report inside a table, it places the comma separator after each numeral in the number (1,2,5,5,7).
From the AwareIM User Guide:
For example, the pattern string for U.S. currency values is:
This indicates that a $ character is prepended to all formatted values. The grouping
separator character , is inserted every three digits. Exactly two digits after the decimal
place are always shown. Negative values are shown in parentheses. Thus, the value -
1234.56 produces output like: