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Nested filter produces error

Hi all,

I'm trying to get a filter to work as I want, but alas.
First an outline of what I want:
All employees in our table '5200 - Employee' have a field 'Manager No.' I want to filter this table so I get the unique Manager No.'s which I then want to use as input in a Lookup-function on the table '156 - Resource'.
I don't want to let users scroll through all resources in order to find the manager; a shortlist is preferrable.

So I built the Lookup function as follows:
=NL("lookup","Resource",{"No.","Name","Global Dimension 1 Code"},"No.",NL("Filter","Employee","Manager No."))
This results in a JetEssentials error stating that it is an 'invalid Lookup formula' (screenshot is attached).

What am I doing wrong here?

Thanks in advance,

Willem

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