Solution : https://service.sap.com/sap/support/notes/1083284 (SAP Service marketplace login required)
Key words : 
thecredit management oil integration project, correction reports rvkred77 / rvkred88, sd credit management, symptom functional description, prerequisites functional gaps, missing partial adaption, function module oi0_mcs_determine_convers_mode, note delivers correction, note delivers corrections, integration project
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