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var sizeChartID = null;
var category = pdict.Product.primaryCategory;

while (category !== null && sizeChartID === null) {
	if (('sizeChartID' in category.custom) && !empty(category.custom.sizeChartID)) {
		sizeChartID = category.custom.sizeChartID;
	}
	else {
		category = category.parent;
	}
}