OnLookup event Handler and Assigning financial dimensions while importing in D365FO

public static RecId assignDefaultDimensions(LedgerDefaultDimensionValueSet defaultDimension, str costCenter, str BusinessUnit)

    {

        DimensionAttributeValueSetStorage davss;

        DimensionAttribute dimAtrrCC,dimAtrrBU;

        DimensionAttributeValue dimAtrrCCValue,dimAtrrBUValue;

        davss = DimensionAttributeValueSetStorage::find(defaultDimension);

       

        dimAtrrCC = DimensionAttribute::findByName('CostCenter');

        dimAtrrBU = DimensionAttribute::findByName('BusinessUnit');

        dimAtrrCCValue = DimensionAttributeValue::findByDimensionAttributeAndValue(dimAtrrCC, costCenter, true, true);

       

        dimAtrrBUValue = DimensionAttributeValue::findByDimensionAttributeAndValue(dimAtrrBU, BusinessUnit, true, true);

       

        if(dimAtrrCCValue)

        {

            davss.addItem(dimAtrrCCValue);

        }

        if(dimAtrrBUValue)

        {

            davss.addItem(dimAtrrBUValue);

        }

        return davss.save();

    }

[FormControlEventHandler(formControlStr(VendEditInvoice, Code), FormControlEventType::Lookup)]

    public static void Code_OnLookup(FormControl sender, FormControlEventArgs e)

    {

        Query                   query = new Query();

        QueryBuildDataSource    queryBuildDataSource;

        SysTableLookup          sysTableLookup;

        EcoResCategory          ecoResCategory;

        sysTableLookup = SysTableLookup::newParameters(tableNum(EcoResCategory),sender,true);

        sysTableLookup.parmUseLookupValue(false);

        sysTableLookup.addLookupfield(fieldNum(EcoResCategory, Code));

        queryBuildDataSource = query.addDataSource(tableNum(EcoResCategory));

        sysTableLookup.parmQuery(query);

        sysTableLookup.performFormLookup();

        FormControlCancelableSuperEventArgs ce = e as FormControlCancelableSuperEventArgs;

        ce.CancelSuperCall();

    }