Thank you but my joy was short lived.
In fact, not that the above solution does not work, but I had forgotten that I had too many lines in my list list2 (4800 lines .....).
The consequence is that the form load I have a message like "The amount of data returned by a data connection exceeds the configured maximum
limiste ..... etc ...) and when I test it, IE crashes(too heavy) ... (I have 2-3 connections receive data in addition to my list + 1
shipment).
I created a form with only my two lists and after publication, I have no worries. I think it is not possible to call a form from my main form
except perhaps by coding. The idea is that I get the value from form 1 to get the desired result to the form 2, and this, dynamically
(I don't know how to encode in infopath ...)
Otherwise, I thought to put an excel file as an attachment to the form. By opening a macro recover the
values of my fields and would display the desired detail (the detail is already in Excel), and always dynamically, when I insert some datas in
the form, or Conversely, I click a button on my form, it launches Excel by sending data from my fields, and details would be displayed via a macro.
Of course, I do not know how to retrieve the values of my form fields dynamically in Excel and so I look for ......
So, I take all suggestions, ideas, etc. help .... Thank you in advance. PS: also posted a message on another forum