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This is the formula which will be evaluated before each time the group is processed. Use the string "=" to assign, or "+=", "-=", "*=" or "/=" in front of the formula to manipulate the current value.
In formulas you can refer to number data base fields by simply specify a name, i.e. ORDERS.PRICE. The event OnReadFormulaVar will be triggered to read the value. If the variable was not found the value will be always 0.