The Euro is breaking down through both the neckline of a head and shoulder pattern as well as the 50 period moving average on the 4 hour chart in what looks like an interesting development as the market assesses today's strong import numbers from China

4 Hour Chart

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One approach to stop loss policy in this circumstance is to us the 20 period moving average to position  the initial stop.

The 100% level shown on the chart projects the height of the pattern from the point at which price broke the neck line which is commonly used for a profit objective.