Multi select detail - Show chosen lines as selected

Hi 

I made a Multi Select lookup as described in this article using ConfigurationEnums:

https://academy.creatio.com/documents/technic-sdk/7-16/creating-detail-selection-lookup

It can be also done using LookupMultiAddMixin as described on this article:

https://academy.creatio.com/documents/technic-sdk/7-15/adding-multiple-records-detail

Theses two articles lead to the same result in different ways.

In both methods, selected records are filtered out from the selection.

My question is how to make the chosen records be shown on the lookup as checked, if they were already chosen.

I can cancel the filter but when doing so, chosen records are displayed as not chosen. The check box remain empty.

Did anybody succeeded in doing so ?