Variable fields which exist in the form set can be used in the source expression. Variable field names which are used in the source expression must be written in a particular format. The name must be enclosed in quotes. Here is an example:
$SubTotal = sum ("Amount")
In this example, the sum of the all section fields that have names starting with Amount are subtotaled. The result is stored in the decimal target variable named $SubTotal. Form set field names are not case sensitive.
If you want to use a particular field name, the name must appear in this format:
Be sure to include the parentheses and the quotation marks.
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