In Spreadsheet decision tables, RuleSet property SequentialMaxPriority and SequentialMinPriority are for controlling the salience number range of Rules generated from Decision Tables.

https://access.redhat.com/documentation/en-us/red_hat_decision_manager/7.4/html/designing_a_decision_service_using_spreadsheet_decision_tables/decision-tables-defining-proc#decision-tables-rule-set-entries-ref

By setting Sequential=true without SequentialMaxPriority and SequentialMinPriority, the salience starts with 65535 and it's decremented one by one through all rules across multiple RuleTables.

On the other hand, by setting Sequential=true WITH SequentialMaxPriority,
every RuleTables starts with value specified by SequentialMaxPriority as salience.
i.e. first rule of each RuleTebles has same salience if there are multiple RuleTables.

In other words, when SequentialMaxPriority is set, start value of salience is reset per RuleTables, but this is unexpected.