Solution : https://service.sap.com/sap/support/notes/755798 (SAP Service marketplace login required)
Key words :
'ddic object' -> table type create table type 'rmsaty_pp_relatn_ext', 'ddic object' -> structure create structure 'rmsas_pp_relatn_ext', function module select function module 'rmsa300_pp_read', enhanced relation table row type, component type eserecn select 'enhance, enhanced relation table components, component type rcpt_pp_relatn recntvh, select function module 'rcp321_ehs_map', entries long wait times, prerequisites performance optimization solution
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