Solution : https://service.sap.com/sap/support/notes/1617578 (SAP Service marketplace login required)
Key words : 
active queryrewrite rule flattensubqueries, update queryrewriterulesset active = ', issue incorrect results, incorrectly semantically transformed, queryrewrite rule flattensubqueries, terms correlated subquery, correlated subquery, flattensubqueries reason, rulename = 'flattensubqueries', queryrewrite component
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