Please read the first part of this blog if you have not read already.
Now for developing custom workflows, some manual configuaration is required.
Execute the Transaction SWU3.
Menu Path: Tools -> Business Workflow -> Development ->Utilities->Automatic Workflow Customizing
Now under Maintain Definition Environment node, select and execute node Maintain Prefix Numbers.
On the next screen, click on change button as shown in figure.
In the Avaiable Prefix Numbers for Workflow and Organizational Management block click on create button. A dialogue box will appear as shown below. Fill the Prefix Number field with any value between 900 and 999. This prefix number will be used by system for prefixing your custom developed workflow id number. Also fill SAP System ID and Client ID fields with values NSP and 001 (if you are using default client 001 otherwise with client id of your system).
Then click on save button to save the new prefix number entry with usual procedure of assignment to package. The system will show the green active status of this newly created prefix number entry as shown below.
Note: The value in package column will vary based upon the package you have assigned your prefix numbers to.
Now the SAP system is ready for developing custom workflows. You can execute tcode SWDD (Workflow Builder) and then create and test your custom workflows for learning purpose. Your SAP NetWeaver AS ABAP 7.02 SP6 32-bit Trial Version is now ready for both executing and developing workflows.
Enjoy the learning of SAP Workflows.