Second instance failed. Approval process.

I really need your help , dear experts.

Approval process WS4000014. Object BUS2211. Problems with error of the second instance. This Workflow process starts from Z class. Firstly, in the second instance the step “Determine Process Decision Status” return parameter “Process Decision” - ACTV. But the step “Get Decision of Current Level” return APPROVED. The step “Handle Process Finish” return error “ Interrupting infected in business class “ – required rollback”. The first instance of successful approved SRM document. In BBP_PD status SRM document - Released.

Secondly, instance error on the step “Create Decision Sets”. Method Create_decision_set class /SAPSRM/CL_WF_PROCESS_MGR_SBWF return exception CX_SY_REF_IS_INITIAL and “ Exception CX_SY_NO_HANDLER triggered by /SAPSRM/CL_WF_PROCESS_MANAGER=CM007 in line 1 with text: “.The first instance of successful approved SRM document. In BBP_PD status SRM document - Released.

I will be very grateful for your help.