How to change the value of a default dimension of a record in AX 2012

static void changeDimensionValue(Args _args)
{
    DimensionAttributeValueSetStorage dimensionAttributeValueSetStorage;
    DimensionAttribute dimensionAttribute;
    CustTable custTable = CustTable::find("US-014");
    DimensionValue oldDimensionValue;
    DimensionValue newDimensionValue = "011";
    DimensionDefault newDimensionDefault;

    #define.dimensionName("CostCenter")

    DimensionValue getDimensonValue(DimensionDefault _dimensionDefault)
    {
        DefaultDimensionView defaultDimensionView;
        select firstonly DisplayValue
        from defaultDimensionView
        where defaultDimensionView.Name == #dimensionName
            && defaultDimensionView.DefaultDimension == _dimensionDefault;

        return defaultDimensionView.DisplayValue;
    }

    // Get current value
    oldDimensionValue = getDimensonValue(custTable.DefaultDimension);

    // Build DimensionAttributeValueSetStorage
    dimensionAttributeValueSetStorage = DimensionAttributeValueSetStorage::find(custTable.DefaultDimension);

    // Remove old dimension value
    dimensionAttribute = DimensionAttribute::findByName(#dimensionName);
    dimensionAttributeValueSetStorage.removeDimensionAttributeValue(
        DimensionAttributeValue::findByDimensionAttributeAndValue(dimensionAttribute, oldDimensionValue).RecId);

    // Set new dimension value
    if(newDimensionValue != "")
    {
        dimensionAttribute = DimensionAttribute::findByName(#dimensionName);
        dimensionAttributeValueSetStorage.addItem(
            DimensionAttributeValue::findByDimensionAttributeAndValue(dimensionAttribute, newDimensionValue));
    }

    newDimensionDefault = dimensionAttributeValueSetStorage.save();

    ttsbegin;
    custTable.selectForUpdate(true);
    custTable.DefaultDimension = newDimensionDefault;
    custTable.update();
    ttscommit;

}