生成LedgerDimension

public static RecId getDimension(str _ledgerAccount, str _businessUnit, str _costCentre, str _department, str _cashflow_cn)
    {
        DimensionServiceProvider      DimensionServiceProvider = new DimensionServiceProvider();
        LedgerAccountContract        LedgerAccountContract = new LedgerAccountContract();
        DimensionAttributeValueContract   ValueContract;
        List                ListValueContract = new List(Types::Class);
        dimensionAttributeValueCombination dimensionAttributeValueCombination;
        DimensionStorage          dimStorage;
        if (_businessUnit)
        {
            ValueContract = new DimensionAttributeValueContract();
            ValueContract.parmName('BusinessUnit') ;
            ValueContract