Leading Zeroes

Hi,

We have leading zeroes in one of the segment in chart of Accounts. we used the below code for showing the leading zeroes

<fo:bidi-override direction="ltr" unicode-bidi="bidi-override"> <?format-number:INVOICE_NUMBER;'09999999'?> </fo:bidi-override>"

When we take the output, it is showing properly. However, if we take the length of that segment it comes to 7 instead of 5. The lenght of CoA segment is 5. The other two digits are '??' which are invisible. When we paste the values of segment in other excel workbook, the value is shown as ??00001.

Any thoughts on how to remove the ??

Regards