Cross Sheet reference involving dates shows INVALID DATA TYPE


I am working on some inventory check and report.

Inventory sheet as follows:

Metric sheet to report on monthly incoming by items and month as follows:

I am trying to refer to the Inventory Sheet to sum Qty In if:

1) Level is 1 (I don't want the parent row to be calculated)

2) Equipment Description matches the primary column

3) Month matches [Nov20]2

4) Year matches [Nov20]1

But I keep getting invalid data type error.

Can anyone assist? Thanks.

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