They record the revenues as product is shipped. The presumption is that it will all be collectible. However, they discovered that the customer from that shipment back in Q4 2019, is close to insolvent, so they record an estimate of that amount they believe they won’t collect.
To be clear, that has NOTHING to do with this customer. This customer is paying every 30 days as the monthly invoice comes in.
Bad debt. The last customer they were providing parts for didn't pay for all the parts ordered. This was the prior customer that they were serving through LF facility.
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