When creating the External Payment Parameters for a Payment Method, it automatically load all the message codes connected to the payment format and issuer.
If there are multiple issuers and messages codes, lot of records will get added.
When dealing with many banks globally, there can be many Issuers.
But there is no option to delete multiple records, which need to be done by one by one. Dealing with many banks globally and there can be many Issuers, which will create many unnecessarry records in this window and that needs deleting.