Solution : https://service.sap.com/sap/support/notes/433304 (SAP Service marketplace login required)
Key words :
additional key words short dump, system generates error message vl338, prerequisites option 'copy item number', deactivate option 'copy item number', option 'copy item number', execute function 'supply order', solution function 'supply order', runtime error message_type_x occurs, 'item xy exists, form routine lips_bearbeiten