There some way to update an process variable who your situation is concluded?

There some way to update an process variable who your situation is concluded ? Somehow, the process was concluded and one parameter was updated wrong.
When you choose the option "Conclude" in a checkbox, the process will call a expression and sets a variable with a status to finalize the process totally. But the value of variable "conclusion date" was defined with NULL.
So we need include this information into this instance to extract the report correctly.

Any help are welcome...

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