AR Tracker - reasons why "Hold Invoice" might be yellow?

Wondering why “Hold Invoice” indicator would display as yellow in the AR Invoice Tracker?
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Reason I noticed
The invoice is not listed on the Sales Gross Margin report (LastYear)

  • spotted while trying to duplicate a value shown on the customer tracker with a BAQ.
    ( Cust Tracker --> Financial --> Aging --> Net Invoice Total (Last Years) ).

So far, I can’t see any reason why the invoice above is omitted from SGMargin report
– except Hold Invoice is yellow in the tracker, (even though InvcHead.InvoiceHeld and InvcHead.HoldInvoice are both false)?

Please ignore
My mistake, the invoice actually was on the SGM report, just out of sequence.

but, I would still be interested in any examplesof putting an invoice on “hold”.
Why, what it does/doesn’t do? It’s just another one of those features I’ve never noticed/used.