How to change or remove a Payee from an Investment transaction

[Jack]

I have a payee I call "&Useless" which I created years ago as a magent  
for those imported transactions where I did not want a Payee.  However,  
I now find I have an Investment Transaction (interest) where that Payee  
is assigned to the split for the Brokerage Account.  I have now  
switched this payee to "No matching" but I don't know what this will  
do.  I do not expect to do another import until the end of the month,  
although I will try to do a small test import to see.

However, my current problem is that since this is an Investment  
Transaction, the Payee does not show up as one of the fields in the  
transaction editing form.  Is there any way to change or remove this,  
other than manually editing the XML file?

For background, the historic interest transactions in this account  
prior to mid 2022 have a Payee assigned, but are plain interest depoits  
into the brokeragea account.  Since then, the transactions were  
imported via OFX as investment dividend/interest investment  
transactions, bot only the first six of them have the payee assigned.   
I have no memory of what changed at that point, or what i did  
differently after import.

The past two months have been imported via csv, using a script which  
processed the actual downloaded tab separated file into something  
acceptable to the CSV Importer.  I'm hoping this is only a temporary  
approach, but changing it will require me to write a totally new  
importer, at least initially specifically for the '.dnl' (tab  
delimited) files currently being spit out by Merrill Lymch.

Thanks for any thoughts.

Jack