AX 2012 Split Default Dimension to get Department

Public display Description Department()
{

    
    Name dimensionAttributeName;
    RecId DepartmentAttribute;
    DefaultDimensionView dimensionView;
    DimensionAttribute dimensionAttribute;
    DimensionAttribute      dimAttribute;

    dimensionAttributeName = "Department";
    DepartmentAttribute = DimensionAttribute::findByName('Department').RecId;
    

            select firstOnly dimensionView
            where dimensionView.DefaultDimension == this.DefaultDimension

            join dimensionAttribute
            where dimensionView.Name == dimensionAttribute.Name &&
            dimensionView.Name == dimensionAttributeName;
            dimAttribute = DimensionAttribute::find(dimensionView.DimensionAttributeId);
    return DimensionFinancialTag::findByFinancialTagCategoryAndValue(dimAttribute.financialTagCategory(), dimensionView.DisplayValue).Description;
}