It's not related in any way with compatibility modes. Perhaps you can lock the rows in a subquery.
select coalesce(max(sequence) + 1, 1) from (select sequence from <table> r where r.report_id = ? for update) -- You received this message because you are subscribed to the Google Groups "H2 Database" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/h2-database. For more options, visit https://groups.google.com/d/optout.
