Solution : https://service.sap.com/sap/support/notes/641959 (SAP Service marketplace login required)
Key words :
attached source code corrections, schedule line mapping reason, existing crm document, schedule line processing, incorrect processing sequence, schedule line, subitem exists, error v1336, terms transfer, releases 2003_1_46c
Related Notes :
609275 | R/3 upload: Error: Schedule line number is already available |