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Number Of Units To Purchase
Currency brokers normally only allow a certain multiple of units to be purchased at a time. Some brokers allow multiples of 1000, some of 10,000, and there are still some hold-outs mandating multiples of 100,000. (100,000 units = 1 contract).
Although there is 1 forex broker which allows any number of units to be purchased, that is certainly not the norm. So you can't buy 123,456 units - you would have to buy 123,000 units or 120,000 units or 100,000 units depending on the multiple allowed by your broker.
This is important when it comes to calculating the number of units that ATM will buy. If you enter a percentage of the balance to be used on each trade (in the money management settings), then that percentage is regarded by ATM as the absolute upper limit. ATM only ever rounds-down. The following table gives examples:
| ATM Wants To Purchase (Units) | Oanda | Multiple of 1K | Multiple of 10K | Multiple of 100K |
| 1 | 1 | 0 | 0 | 0 |
| 3,769 | 3,769 | 3,000 | 0 | 0 |
| 9,999 | 9,999 | 9,000 | 0 | 0 |
| 10,000 | 10,000 | 10,000 | 10,000 | 0 |
| 32,769 | 32,769 | 32,000 | 30,000 | 0 |
| 99,999 | 99,999 | 99,000 | 90,000 | 0 |
| 100,000 | 100,000 | 100,000 | 100,000 | 100,000 |
| 132,769 | 132,769 | 132,000 | 130,000 | 100,000 |
| 199,999 | 199,999 | 199,000 | 190,000 | 100,000 |
| 200,000 | 200,000 | 200,000 | 200,000 | 200,000 |
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