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@Jura: In an inverted market bid and ask orders are crossed, but cannot be matched.
The explanation is pretty easy and depends
-> on the order types allowed by the exchange
-> the matching rules used by the matching engine
The example that you have posted shows a buy limit order for 500 lots at bid 1.46280 and a sell limit order for 7 lots at ask 1.46280. If those cannot be matched, the explanation can likely be found with the order type of the buy limit order.
You might have heard about Fill-or-kill orders, which must be executed immediately or will be removed from the order book otherwise. As the buy order is still sitting on the book, it cannot have been a Fill-or-kill order, but we need to look for other order types:
All-or-none: An order type requiring that the entire order is filled.
Minimum-volume: This order type allows large participants to avoid that their order is crossed with an odd lot order. If you want to buy 10,000 shares, would you be happy, if you end up with 7?
Uncommited orders: This order type requires confirmation prior to execution.
The example shows that it is important to know
-> which order types are available on the exchange that you intend to trade
-> how the matching algorithm works (time price priority, pro-rata-allocation etc.)
This information can be usually downloaded from the exchange.
For a brief introduction to order types see Barry Johnson: Algorithmic Trading and DMA, 4Myeloma Press, 2010, Chapter 4: Orders, pp 83-113.
General members are not allowed to trade among them, but have to deal with a broker. I did not think about the possibility that some animals are more equal than others ....