function is used to access the contents of a data item before the data item has been entered. When an item is on a form as a field, CSPro will give its value in logic as notappl
until the item has been entered. If you know that the field has been previously filled, perhaps because the operator is in modify mode or is resuming from a partial save, you can use this function to get the value stored in the item that is on the form and represented as field_name
This function is for use only with numeric fields. Refering to alphanumeric fields will always result in the evaluation of the field's visual value.
The function returns the numeric value of the field.