We are doing a legacy->XI-> Idoc (R/3) scenario. I am getting an error Unable to convert the sender service LEGACY_BS to an ALE logical system . The legacy business system is set as a third party Business system and has a logical system Legacy_LS set to it. In the ID for the business service Legacy_BS, I am not able to set the logical system in the adapter specific identifiers. Is this the reason for the error Unable to convert the sender service LEGACY_BS to an ALE logical system.