Description of problem:

It is not possible to complete a processs / task in the task list. In both cases you get an error.

Version-Release number of selected component (if applicable):
kie-wb-6.0.0-SNAPSHOT-eap-6_1.war from the 6.0.x branch deployed in a JBoss EAP 6.1

How reproducible:

1 Create a project
2 Create a data Model
datamodel_1 = three fields; 1st string, 2nd string, 3rd pointing to datamodel_2
datamodel_2 = two fields; 1st string, 2nd string
3 Create business process : start - task 1 (user task) - task 2 - end
4 Define in business process:
Properties BPMN Diagram: define Variable definition
Properties of task 1: edit DataInputSet
edit DataOutputSet
edit Assignments
edit actors
edit TaskName
5 Validate process
6 Generate all Forms
in Form definitions should be two forms
processID-taskform
TaskName-taskform
7 Generate sub form New Item --> New Form
edit ID
edit Input ID
edit Output ID
Type: From Data Model --> datamodel 2
Add field by origin (field1 and field2)
8 Adjust already created forms (processID-taskform and TaskName-taskform) and add the sub form

9 GoTo ProjectsScreen

10 Save File

11 Build & Deploy

12 GoTo Process Management / Process Definitions

13 Start a process - fill form

14 GoTo Tasks / Task List

15 Start Process

16 Complete process: https://gist.github.com/mbiarnes/6582578

17 Complete task: https://gist.github.com/mbiarnes/6582594

Actual results:
https://gist.github.com/mbiarnes/6582578
https://gist.github.com/mbiarnes/6582594

Expected results:
It should be possible to complete a process or a task

Additional info:
This was tested in a EAP 6.1 - not yet in a AS 7. If it doesn't work neither in AS7 I will comment it.