def enter_qty(oFieldsReporter, FieldQuantityString):
    """
    Enter a field quantity into the Fields Calculator.
    
    Parameters
    ----------
    oFieldsReporter : pywin32 COMObject
        An HFSS "FieldsReporter" module 
    FieldQuantityString : str
        The field quantity to be entered onto the stack.
        
    Returns
    -------
    None
    """
    return oFieldsReporter.EnterQty(FieldQuantityString)