Serial Number wrongly received, Cant able to change to upper case once receipt is done

We have an issue where FMC received a particular part into stock they scanned the serial numbers and they were entered with all Capital letters ex (CANXXXX) On the receipt they were entered in lower case (canxxxx).

We tried performing Account Alias Issue of wrongly enter serial and do Account Alias Receipt with the Correct serial Number. But when we tried to do AAR system by default taking the lower case serial when tried to enter.

Please suggest if there any other possibility to correct the serial