Catalogue Price Rule Not discounting configurable products correctly

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This magento discussion was started by Andrew Banks on 09 February 2010

We have a site selling shirts and use configurable products for this.
We have one configurable product and then multiple simple products for each size option.
Above a certain size we increase the price of this shirts.
As an example, our configurable product has a base price of £10 and our price breaks are as follows:

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