https://userapps.support.sap.com/sap/support/knowledge/en/2864396
2864396 - ODP extractors cannot be seen in the datasource list when replicating to BW system | SAP...
You're trying to replicate ODP Datasources from the ODP source system (ERP, S/4HANA, CRM...). But the Datasources are not coming to BW.