How to change serial no on mass basis *
As per my knowledge you can not change this thru the transaction code but you can try to do this with serial number profile
few prerequisites exist for this
If a serial numbers exist for the material and you want to cancel or change the serial number profile, you should note the following:
1) The previously assigned serial numbers are no longer suited to the current serial number profile.
2) The indicator for the stock check may have changed. If this is the case, you can copy the profile settings in the serial number using the executable report program RISERNR9. However, you should only start this program once the changes have been updated in the material master record.
Note: If backflushing is defined for the material in the master record, you cannot enter a serial number profile that has serial number requirement for goods movements.