ERror when calling xaction from xaction

[ahauskr]

Hi,

I have a strange problem when executing an xacation from another xaction (SubActionComponent).
The scenario: In the first (outer) xaction a user is prompted to enter a value.
A second (sub-) xaction is called doing another prompt.
Doing so results in an error (see log.txt-file attached. Copied execution result from design-studio frontend).
If the (sub)-xaction called does not contain a prompt, it is executed without an error.
The (sub)xaction with prompt executes without problems standalone.
I am using the PCI 1.5.4-716, and design studio 1.5.4-489
Please find the xaction-files and log attached. The xactions are examples kept as simple as possible, just to show the problem.
First.xaction calls SubPrompt.xaction, both located in the same directory.
If I remove the prompt-step from SubPrompt.xaction, First.xaction executes without errors.
This is urgent. I need this scenario to reuse some prompting-xactions.
Any idea? Thanks a lot in advance for your help,
kind regards,
Alex