1. Creating a logical system (BD54)

About this task

Every SAP R/3 client used for ALE/RFC must have a base logical system (LS) associated with the SAP client.

Note: This association is typically created at installation time by the SAP Applications installation team.

Every base LS becomes the sender for outbound messages and a receiver for inbound messages.

In addition to the base LS, additional logical system(s) must be created within that SAP R/3 system for every SAP R/3 and external system used for ALE interfaces. In an inbound ALE/RFC interface, this second LS represents the sender with respect to the base LS. In an outbound ALE/RFC interface, this second LS is a receiver.

A logical system may be created for each external system that communicates with SAP R/3. The design of your maps and systems dictate what is an external system. Generally, you create an external system to correspond to each distinct non-SAP system.

Transaction BD54 creates a logical system to represent the server system for the distribution of data to and from the SAP R/3 system.

To create a logical system


  1. Enter /nBD54 in the command field and click Enter.
  2. Click Enter in the information window, which alerts you that you are in the process of maintaining a client-independent table and that any changes that you make will have an effect on all other clients in the system.

    The Change View "Logical systems": Overview window opens, listing the logical systems that are currently defined.

  3. Click New entries to create the logical system (LS).

    The New Entries: Overview of Added Entries window opens.

  4. Enter a name for the LS and a meaningful description. (Throughout this example, the LS name will be CUSTOMERLS. The name of the base LS is E47CLNT800.)
    Note: The naming convention you follow for the LS should be informative because it will be used in naming the RFC destination and the partner profiles.
  5. Select CTRL + F4.

    The Change == > Display dialog box opens to confirm the change.

  6. Click Yes to save.

    The Prompt for Workbench request dialog box opens.

  7. To complete the creation of the LS, you must obtain a request number. Create a request number for each new LS added. In the Request field, select a value from the drop-down list and click Enter.
  8. Return to the Display View "Logical systems": Overview window.
  9. Choose Save from the Table View menu and click Enter.

    The LS is created.