Solution : https://service.sap.com/sap/support/notes/937492 (SAP Service marketplace login required)
Key words : 
alter table <table_name> enable row movement, terms frequently asked questions solution 1, invalid lower limit snapshot expression, merging requires sound expertise, resetting individual tables constitutes, undo_sqlfrom  flashback_transaction_querywhere  xid = hextoraw, ddl operation occurred shortly, valid system change number, create table <table_new> asselect, read data - table definition
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