What is the Workflow basic Customizing?
Before you can use the Workflow module, you must first execute the basic Customizing in transaction SWU3. All of the listed points should be green (the number range for customer tasks is no longer required). A detailed description of the activities is provided in the relevant information buttons. You can also execute some (but not all) of the points using the Automatic Customizing button. See the online documentation for an exact description of what happens there. The RFC destination must work correctly and the user (usually WF BATCH) should have the SAP_ALL profile.
