>I didn't say it doesn't work, just not pratical
>
>An invoice subtotal and Tax amount would vary for every invoice, thus cannot be constants unless you are only referencing 1 invoice, which seems pretty silly.
>

Bob:

#Define is used in this case to replace the NAME of the variables, not the VALUE of the variables , its like doing a search and replace of your code and changing the name of a variable named "InvoiceSubTotal" with a name of "_0lOlOl"

Carlos