sql

So if I understand correctly you want to update the value of a process business variable with a value that is not provided by the user in a form. Instead you want to use a value managed by Bonita (such as the name of a task in a process definition or the id of a process instance).

In your example the name of the business variable is ok2 and the type of this business variable is Ok. Ok is a simple business object with 5 attributes: nombre, fecha, numero, aprobar and caso.

Value of nombre, fecha and numero are provided by the user and you want for example to set the value of the attribute caso with the process instance id (i.e. the case id) that is automatically generated by Bonita. Note that the process instance id data type is Long whereas caso attribute data type is String so a type conversion will be needed.

To set the value of caso attribute of the business variable ok2 in the task "prueba caso", you need to add an "operation":

1. Select the task
2. Go in "Execution" -> "Operations" tab (you can see some automatically generated operations that use step contract input to update the business variable attributes)
3. Click on "Add" button to add a new operation
4. Select the process variable ok2 in the left drop down list
5. Click on the "Takes value of" link and change the operator type to "Use a Java method"
6. Select "setCaso"
7. Click on the pencil icon on the right
8. Choose "Script"
9. Enter the script that will convert the process instance id from Long to String type: processInstanceId.toString() (processInstanceId is a variable provide by the Bonita Engine when executing the process)

Now if you run this process you should see the value of the process instance id stored in the database (you can see that by going in Studio menu "Development" -> "Business Data Model" -> "Browse data (h2 console)...".

If you want to display the business variable information for example in the form of a task you add at the end of the process you need to:

1. Create a new form variable
2. Set the name, for example: okForm
3. Set the type to "External API"
4. Set the API URL to: ../{{context.ok2_ref.link}}
5. Add widgets to your form. For example: an input widget
6. Set widget read-only option to "yes"
7. Set the widget value property to: okForm.caso

Here we are duplicating the information about the process instance id (already stored in Bonita Engine database) in the BDM. Instead of doing that we usually call the Engine API for example with this URL ../API/bpm/userTask/{{taskId}} ({{taskId}} will be replace by the taskId form variable value itself initialized using the value available in the URL that load the task form).