Importing a (invalid) CSV file, a 'message specification version' is immediately created, preventing you from adjusting the errors

When importing a (invalid) CSV file, a 'message specification version' is immediately created, preventing you from adjusting the errors without starting over.

Lets walk through it:

I want to create a message model based on CSV, but I forgot to specify a column name.

I get an error to fill in the column name

I change the mistake and add a column name:

I get this error. meaning that I have to start over and create a whole new message model...