Hi Carlos,
Issue is related to RFC, Transport files or Rights and Security with respect to SAP user used in the datastore, Multiple thread is available with respect to same issue, please refer below link for your reference
Import table from Data Services 4.1, Need Help
Calling RFC BAPI within SAP Data Services
Error during import of tables into DS4.1 from ECC | SCN
Data Service 4.1 upgrade issue - R/3 abap data flow error
Thanks,
Daya