Originally it was (as text format ) 23456789. After adding text it read as RNE1.2012E+11 but if I format using format cells only numbers are restored.
closed as too localized by Oliver Salzburg♦ Jul 28 '12 at 16:23
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This method only stores the number, as the 'RNE' is the Custom formatting and the number is just a standard numeric value. It only works for prefixed numeric values, not text or other formatted cell values.
The added prefix text will only stay if the Custom formatting is enabled in Format Cells.