Solution : https://service.sap.com/sap/support/notes/926363 (SAP Service marketplace login required)
Key words :
post-run update, sample roles sap_fin_fscm_dm_rfc_comm, sap dispute management, idoc dispute_process remains, error removing object &1, multi-system scenario, authorization object s_srmrecst, 1-system scenario, dispute case, dispute_process reason