Alexa Error "The following directives are not supported: DelegateDirective" after Connections.Response purchaseResult

I am using ISP (In skill purchase) and after the whole cycle of purchasing Alexa handle the control back to the skill backend.
So I get a Connections.Response with purchaseResult:ACCEPTED

Now I send a Delegate Directive to an Intent to collect a number

 return handlerInput.responseBuilder
        .addDelegateDirective(myVoiceSelectionIntent)
        .getResponse();

Now I got the following error:

  "error": {
      "type": "INVALID_RESPONSE",
      "message": "The following directives are not supported: DelegateDirective"

What I tried

I added the same code snipped to an other intent of the skill and I get forwarded to the myVoiceSelectionIntent
I tried to return speech and prompt as well but same error.

Question

Is not possible to use intent chaining and send DelegateDirectives from a Connections.Response with purchaseResult:ACCEPTED?
I could not find anything that it's forbidden in the documentation

Solution

I asked in the amazon developer forum as well after nobody replied and it's not possible yet after a Connections.Response

Jason@amazon: This is a current limitation of intent chaining - you won't be able to use it with any Connections.Response request that comes into your skill