Solution : https://service.sap.com/sap/support/notes/1119835 (SAP Service marketplace login required)
Key words :
srm server -> cross-application basic settings-> sap business workflow, -> srm workflow settings -> workflow settings -> migrate workflows, class /sapsrm/cl_formula_mnt_brf delete, /sapsrm/cl_formula_mnt_brf reason, sap_aba support package 13, attached correction instructions, relevant support package, terms /sapsrm/pr_wf_migration_cfg, /sapsrm/wf_cond_mapping, /sapsrm/wf_cond_mapping_func01
Related Notes :
1148401 | Additional Notes after installation of PPS 2.0 on SRM |