Defining
a Workflow/Task to Be Started with Webforms
You are familiar with the procedure for Defining a Task or Defining a Workflow.
You want to define the task or the workflow that is to be started by the web form.

In addition to the standard definition, you must also expand the container definition with the elements that are entered from your form, and that are to be processed in the workflow.
...
1. To create a workflow, Start the Workflow Builder. To create a task that is to be started as a single step task, Create a Standard Task and define the basic data.
2. Save the workflow or the task in the package that you have also used for the Namespace maintenance.
Now extend the container to include the elements that are to be filled using the form.
3.
If you
create a task, choose
Container to call the container editor. If
you create a workflow, open Workflow
Container.
The container already contains system elements of the Workflow- or of the Task Container as standard.
4. Create a suitable container element for all of the fields you want to fill in the form. Define these elements as import elements. For more information, see Creating Container Element.
You can only transfer single values (not object references) from the form. If you want to add container elements for this purpose, therefore, you must always create them as single-line elements with a data type reference to a table field in the ABAP Dictionary.
When generating the HTML template the container element name is also used as the name of the input field.

Note that when later changes are made to the name of container elements, the web transaction must be regenerated.
5. Complete the workflow definition or task definition.