How to update Tax Registration Number on Credit Memo

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As per localization requirement we have to populate tax registration number to derive the tax invoice . As per business requirement we have multiple tax registration number on one of legal entity which user is currently updating manually on each invoice for transaction interfaced from PPM,DOO,SUBS . 

Now when we are trying to edit the credit memo it is opening into "Credit Invoice" UI , which doesn't have the option to update the Tax Registration Number on credit memo.

Is there any possibility to update the Tax Reg# for Credit Memo on UI manually?

 

Thanks,

Mrigank