Solution : https://service.sap.com/sap/support/notes/184542 (SAP Service marketplace login required)
Key words : 
additional key words stpo-valkz, engineering change management, system generates, update termination, error sapsql_array_insert_duprec, changed item, program error, alternatives, prerequisites, note 148855
Related Notes : 
       
| 148855 | BOM group: deleting item |