Solution : https://service.sap.com/sap/support/notes/667778 (SAP Service marketplace login required)
Key words : 
exception sapsql_array_insert_duprec occurs, terms cx_sy_open_sql_db reason, source code correction, client copy, report rctxtcpy, program error, solution implement, termination, reprocessing, prerequisites
Related Notes : 
       
| 749247 | PS texts do not exist after client copy | 
| 601196 | Client copy: Problems with report RCTXTCPY |