Error on running an automation rules

[Alexandra Militaru]

Starting a ticket created on a space/ project, I am trying to make an automation to create an epic to another space triggered by a status transition on the initial ticket.
I cannot succeed to make it work, despite the fact I've tried many approachs. The last one corresponding to the screenshots below. 
Anyone have an ideea ?

[Bill Sheboy]

Hi @Alexandra Militaru 

To dynamically select a project for the Create Work Item action, please use the project's numeric ID value rather than the key.

Kind regards,
Bill

[Alexandra Militaru]

Hi Bill,

Thank you for your answer. Unfortunately, I've tried also this approach and I have the same issue. 

[Bill Sheboy]

The project ID (i.e., the numeric value) must be used, not the key (i.e., the alphabetic one).  Is your custom field a project picker?  If so, please try this:

{{issue.customfield_10400.id}}

or this

{{issue.customfield_10400.value.id}}