Solution : https://service.sap.com/sap/support/notes/722490 (SAP Service marketplace login required)
Key words :
'enqueue wait' entersthe code context, 'db commitor 'roll back', 0b import support package 21, import support package 15, 50 import support package 03, 0b support package 21, work process inserts, work process isattempted, 1c support package 15, support package
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