At the bottom of the view, there is a text with a status of the workflow (see figure 9.23). It will inform about the actions you need to take to finalize the workflow.
Figure 9.23: A workflow is constantly validated at the bottom of the view.
The validation may contain several lines of text. Scroll the list to see more lines. If one of the errors pertain to a specific element in the workflow, clicking the error will highlight this element.
The following needs to be in place before a workflow can be executed:
- All input boxes need to be connected either to the workflow input or to the output of other tools.
- At least one output box from each tool needs to be connected to either a workflow output or to the input box of another tool.
- Additional checks that the workflow is consistent.
Once these conditions are fulfilled, the status will be "Validation successful", the Run button is enabled. Clicking this button will enable you to try running a data set through the workflow to test that it produces the expected results. If reference data has not been configured (see Configuring workflow elements), there will be a dialog asking for this as part of the test run.