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in order to import data from a Database on Business Driver already available in TSCO as imported from a CSV file, you can actually use two different ETL tasks. You just configure the two ETL to share the same entity catalog and reconcile on the same lookup fields and values.
Generally speaking, you can have more than one ETL tasks importing data on the same TSCO entity (either a system, a business driver or an application). ETL importing data for the same set of entities must share the same entity catalog and lookup details. You can find more information at the following page at the documentation Understanding entity identification and lookup - Documentation for BMC TrueSight Capacity Optimization 11.5 - BMC Docume…
Alternatively, if you have already duplicated some entities because you forgot to share the entity catalog, you can perform a manual reconciliation to inform TSCO that two entities should be matched. You can find more information at the following page of the documentation Reconciling and managing duplicate entities of a vCenter host or VM - Documentation for BMC TrueSight Capacity Optimizat…