Well i did it in js:

            onEntityInitialized: function() {

               

                this.callParent(arguments);

                

                if (this.get("Stage").value === "991d70f4-7a10-42b8-bb9c-fd8096d05d9b") {

                    this.showInformationDialog("Set the new Date to call");

                    this.set("DateToCall", null);

                }

            }

If someone knows how to set a Date to Null in a process, i m interested with

LÉZORAY Nicolas,

You can create date parameter and leave it empty. Then specify this parameter as a value that must be inserted to date field. It will leave this field empty or make it empty if it was filled in.

Best regards,

Angela

Thank you it works !