Describes the usage of a DataField within a FormLayout.

Enumerator:
eVarUsage_NotUsed  The DataField is defined within the Project but is not used in the FormLayout.
eVarUsage_Normal  A normal DataField. The DataField is in use by the FormLayout, its value is not modified. The DataField is just used as part of expressions or directly in text-, bar-code or picture elements. Therefore the value for this DataField may be provided by an external application or by the user.
eVarUsage_Calculated  The DataField is computed automatically. The DataField is in use by the FormLayout and its value is modified. Usually this is done via pre- or post-expressions. Therefore the value for this DataField may not be provided by an external application or by the user.
eVarUsage_Parameter  This is a writable system-DataField used by the FormLayout. The value of this system-DataField may be provided by an external application or by the user (e.g. tfDocumentName).
eVarUsage_Invalid  Invalid DataField usage.


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