Solution : https://service.sap.com/sap/support/notes/186653 (SAP Service marketplace login required)
Key words :
select 'interface' choose 'change', additional key words hf_integrated_cost_reporting, function module hf_integrated_cost_reporting, type proposal optionali_buffer, investment program positions, 'import' list make, project planning board, planning board, enter 'hf_integrated_cost_reporting', import ref
Related Notes :
134621 | IM/PS reporting: Plan/budget/residual plan differ |