The Development Package of the SAP ABAP system is a structure for organizing development objects, which can be tables, views, classes, function modules, etc. These development objects are stored in a transmission request called Transport Request. The Transport Attribute (transmission attribute) is an attribute description of these transmission requests. They are an important part of SAP system change management and are used to organize and control the transfer of system changes.
As shown in the highlighted area in the figure below:
Transport Layer (transport layer) is an important attribute of Transport Attribute, which is used to define the transmission path of development kits and objects. The transport layer determines the order in which objects are transported within the system landscape. For example, if you create an object in the development system and want to transfer it to the quality assurance system and then to the production system, you need to define a transport layer to determine the transfer path of this object.
For example, suppose the SAP System landscape includes a development system (DEV), a quality assurance system (QAS) and a production system (PRD). A development package is created in the DEV system and contains a new ABAP class. We want to transfer this ABAP class from DEV to QAS and then from QAS to PRD. To achieve this, one needs to be defined for this development package 传输层.
In the SAP system, you can use SE80 or SE01 transaction codes to set up the transport layer. When creating the development package, you will be prompted for the name of the transport layer. Usually, the name of the transport layer reflects its transport path. For example, the transport layer can be named "DEV_TO_QAS_TO_PRD" to indicate that the path of this transport layer is from DEV to QAS and then to PRD.
After defining the transport layer, you can create ABAP classes in this development kit. After creating and activating this class, you can use SE09 or SE10 transaction codes to create a transfer request. When creating a transfer request, you need to select the development package you created earlier and add it to the transfer request. The system will automatically add all objects in the development package, including ABAP classes, to this transfer request.
After completing these steps, the transfer request can be released and the STMS transaction code used to transfer it to the QAS system. In the QAS system, you can check that your ABAP classes are transferred correctly and carry out the necessary tests. If everything is ok, you can transfer this transfer request to the PRD system again, so that the ABAP classes will take effect in the PRD system.
In general, the Transport Layer attribute of the Transport Attribute of the SAP ABAP system is used to define the transmission path of development packages and objects. By setting up and using the transport layer correctly, you can effectively manage changes in the SAP system and ensure that these changes can be transmitted to the destination system according to the expected path.