JavaScript is a case-sensitive language. This feature means that a keyword, a function name, a variable name, or any other identifier must always be typed using the correct capitalization. For example, you must type the getDate( ) function as getDate( ), not as GetDate( ) or getdate( ). Similarly, myVar, MyVar, MYVAR, and myvar are four different variable names.

Data set field names are case-sensitive. When referring to a data set field in an expression, specify the field name with the same capitalization that the data source driver uses to identify the field. As mentioned previously, Output Columns in the data set editor shows the fields. If you use the expression builder to write an expression, select a field to insert in the expression to ensure that the correct field name is used.