Solution : https://service.sap.com/sap/support/notes/836740 (SAP Service marketplace login required)
Key words :
oltpsource = 'name_of_datasource'param_name = 'objselsize', oltpsource = ' 'param_name = 'objselsize', attached program corrections, note provide users, set parameter improved, database table bwom_settings, datasource independent entry, parameter objselsize, table bwom_settings, bwom_settings table
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| 1424403 | BW-BCT: Performance when using CO line item extractor |
| 382329 | Delta extractors CO: Poor performance |