Solution : https://service.sap.com/sap/support/notes/1746286 (SAP Service marketplace login required)
Key words :
terms cl_crm_email_utility_base get_mail_data_from_send_req reason, prerequisites program error, support pack outlined, symptom redundant file, correct file, crm system, knowledge repository, method getu_filename, class cl_document_bcs, solution implement