webMethods suggestion: (saved lot of effort)
It might be easier to use a different JDBC connection pool for 8.0 notifications with a different database/username within the same database instance on the same database server. This way, when your 8.0 notifications create the buffer table, it will be in a different schema than the 6.5 buffer tables. You would make sure that the 8.0 DB schema name has the same privileges as the 6.5 schema name.
#webMethods#Integration-Server-and-ESB#webMethods-Archive