Tcode STMS -> Tools → Administration → Transports →  Transport
Management System.
 The Transport Management System (TMS) allows transports between different R/3  Systems to be administered centrally.
 The TMS classifies R/3 Systems into  transport groups and transport domains:
A transport group  consists of all R/3 Systems that can access a common transport  directory.
A transport domain consists of one or more  transport groups.
To enable transports to be administered centrally, it must  be possible to administer all systems in the transport domain from a designated  R/3 System, called the transport domain controller.
  For the administration of transports, the following information is stored  centrally:
 The systems participating in the transports
 Their transport  routes
 This configuration data does not need to be set manually in every  R/3 System. Instead, using RFC, the transport domain controller distributes the  data to all participating R/3 Systems.
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Transport Management System (TMS):
TMS: Administering R/3 Systems
To create a transport domain, call the TMS from Client 000. To automatically  define the transport domain controller as as the current system choose Tools →  Administration → Transports → TransportManagement System.
 As soon as the  domain has been created, additional systems can apply for acceptance by the  domain. For security reasons, these systems are not accepted until they have  been authorized by the transport domain controller.
The TMS System  Overview displays the various system statuses:
 Waiting for  acceptance by the domain
 Active
 System locked for the TMS
 System  not accepted
 System deleted
 Technically, TMS can connect systems with  different R/3 release statuses. However, SAP does not support any transports  between such systems.
 Because of its central importance, the transport  domain controller should run on an R/3 System with a high  availability.
Configuring Transport Routes
 To configure the transport routes between systems in the  domain, use the hierarchical list editor and graphical editor provided by the  TMS. Define these settings in the transport domain controller.
 The  transport routes can be either consolidation or delivery routes.
For  consolidation routes, a transport layer is used, for example to define a 
route between the development and the quality assurance system.
Delivery  routes connect systems, for example the quality assurance and the
production  system. They do not use transport layers.
 Create transport routes in the  graphical editor using drag and drop.
 After the transport routes have been  configured in the transport domain
controller, they can be distributed  across all systems in the domain.
 These setting must be activated in all  the systems in the domain. This can also be
done centrally by the transport  domain controller.
 To enable previous configurations to be reused, you can  create versions in the TMS.
TMS : Setting up an R/3 Transport Landscape
1. Make the transport directory available.
2. Configure the transport  domain controller and define the domain.
3. Configuration of the transport  program (tp) is done automatically and
must not be done at OS level.
4.  In the TMS:
- Include all remaining systems in the domain
- Define the  transport routes
- Define QA approval procedure
5. Set the system change  options according to the role of the R/3 System.
6. Create clients and set  the client change options for the production system,
development system, and  so on.
The steps for setting up a transport landscape  are summarized below.
 To set up an R/3 transport landscape:
  Make a transport directory available to every R/3 System that will be  ransporting.
The TMS allows a local transport directory for every R/3  System.
 To configure the TMS, define the transport domain controller.
  In the TMS:
- Include all remaining systems in the domain.
- Define the  transport routes.
 Set the system change options according to the role of  the R/3 System.
 Create clients in every R/3 System and set the client  change options (production
system, development system, and so on).
R3trans Return Codes
R3trans sets a return code that shows whether or not the transport has succeeded. You can view details on transports in the log file. Here are the following return codes:
0 : No  errors or problems have occurred.
4 : Warnings have occurred but they can be  ignored.
8 : Transport could not be finished completely. Problems occurred  with certain objects.
12 : Fatal errors have occurred, such as errors while  reading or writing a file or unexpected errors within the database interface, in  particular database problems.
16 : Situations have occurred that should not  have.
Examples:
Constants in the program are too small
Not  enough available memory
Internal R3trans error 
Other return codes are not set by R3trans itself but point to errors, such as segmentation faults.
SAP R3trans Unconditional Modes
By using unconditional modes, you can override the rules of the transport  system. The following modes are available:
Export:
· 1: Ignore incorrect status of a change  request.
If you do not set this mode, only change requests with the status A  (all locked), O (open) or R (released) are exported. If the export is  successful, the change request is released by R3trans.
· 8: Allow direct  selection of forbidden tables.
Some tables are part of complex objects and  generally cannot be exported alone.
Import:
· 1: Ignore that this change request was  already imported into this system and import everything again.
If you do not  set this mode, only objects that have not already been imported successfully are  imported again.
· 2: Overwrite originals
· 6: Overwrite repaired  objects
· 8: Ignore the restriction resulting from table classifications and  import all table entries into specified clients.
SAP Netweaver 2004s - Components of Monitoring - System Landscape Directory (SLD)
The SAP System Landscape Directory (SLD) is the central  information provider in a system landscape. The SLD contains two types of  information:
- Component information: all available SAP products and components and their versions. If appropriate, external products are also registered here.
- Landscape description: all installed systems in a system landscape.
 






