Solution : https://service.sap.com/sap/support/notes/107547 (SAP Service marketplace login required)
Key words :
importing import clear free refresh sort, entire table initially means deletion, internal table ends unexpectedly, complete sorting due, relevant endloop instruction, instruction local triggers, symptom loop processing, parameter transfer changing, newly inserted lines, internal loop counter
Related Notes :
599461 | Table exchange after READ/LOOP ... ASSIGNING |
191371 | Billing does no longer work as of AOSP16 |