Solution : https://service.sap.com/sap/support/notes/738641 (SAP Service marketplace login required)
Key words :
form starts background jobs, aggregate realignment run reason, change run job hangs, 10 content import support package 15, 0b import support package 21, change run/rollup, job called rsdu_coalesce-<, changerun rollup hierarchy, transaction st04 displays, row cache lock
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