Assign conditioner DT

Hi all,

I do not understand why I have an error on activity Assign
Assign | leave only PO which should be forwarded 2: Object reference not set to an instance of an object.
Maybe someone can advise what I should change?
2020.11.16.xlsx (9.3 KB) SequenceTESTDT.xaml (9.6 KB)

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forked and merged / continued here: