Error when refreshing dataflow

Hi pqian_MSFT ,

The green indicator on the rows indicates that it is folding however the final step takes approximately 1m 30s to load but the step prior takes only about 20s despite both steps being a concatenation of two fields.

See query plan below along with the native data source query:

select [_].[costamountadjustment] as [costamountadjustment],
    [_].[costamountoperations] as [costamountoperations],
    [_].[costamountphysical] as [costamountphysical],
    [_].[costamountposted] as [costamountposted],
    [_].[dateexpected] as [dateexpected],
    [_].[datefinancial] as [datefinancial],
    [_].[datephysical] as [datephysical],
    [_].[inventdimid] as [inventdimid],
    [_].[inventtransorigin] as [inventtransorigin],
    [_].[invoiceid] as [invoiceid],
    [_].[itemid] as [itemid],
    [_].[packingslipid] as [packingslipid],
    [_].[qty] as [qty],
    [_].[voucher] as [voucher],
    [_].[voucherphysical] as [voucherphysical],
    [_].[dataareaid] as [dataareaid],
    [_].[referenceid] as [referenceid],
    [_].[referencecategory] as [referencecategory],
    [_].[configid] as [configid],
    [_].[inventbatchid] as [inventbatchid],
    [_].[inventcolorid] as [inventcolorid],
    [_].[inventlocationid] as [inventlocationid],
    [_].[inventsiteid] as [inventsiteid],
    [_].[inventsizeid] as [inventsizeid],
    [_].[inventstatusid] as [inventstatusid],
    [_].[inventstyleid] as [inventstyleid],
    [_].[wmslocationid] as [wmslocationid],
    convert(nvarchar(4000), [_].[_FKinventlocation]) as [_FKinventlocation],
    convert(nvarchar(4000), [_].[_FKinventsite]) as [_FKinventsite],
    convert(nvarchar(4000), [_].[_FKinventtable]) as [_FKinventtable]
from 
(
    select [_].[costamountadjustment] as [costamountadjustment],
        [_].[costamountoperations] as [costamountoperations],
        [_].[costamountphysical] as [costamountphysical],
        [_].[costamountposted] as [costamountposted],
        [_].[dateexpected] as [dateexpected],
        [_].[datefinancial] as [datefinancial],
        [_].[datephysical] as [datephysical],
        [_].[inventdimid] as [inventdimid],
        [_].[inventtransorigin] as [inventtransorigin],
        [_].[invoiceid] as [invoiceid],
        [_].[itemid] as [itemid],
        [_].[packingslipid] as [packingslipid],
        [_].[qty] as [qty],
        [_].[voucher] as [voucher],
        [_].[voucherphysical] as [voucherphysical],
        [_].[dataareaid] as [dataareaid],
        [_].[referenceid] as [referenceid],
        [_].[referencecategory] as [referencecategory],
        [_].[configid] as [configid],
        [_].[inventbatchid] as [inventbatchid],
        [_].[inventcolorid] as [inventcolorid],
        [_].[inventlocationid] as [inventlocationid],
        [_].[inventsiteid] as [inventsiteid],
        [_].[inventsizeid] as [inventsizeid],
        [_].[inventstatusid] as [inventstatusid],
        [_].[inventstyleid] as [inventstyleid],
        [_].[wmslocationid] as [wmslocationid],
        [_].[dataareaid] + [_].[inventlocationid] as [_FKinventlocation],
        [_].[dataareaid] + [_].[inventsiteid] as [_FKinventsite],
        [_].[dataareaid] + [_].[itemid] as [_FKinventtable]
    from 
    (
        select [$Outer].[costamountadjustment],
            [$Outer].[costamountoperations],
            [$Outer].[costamountphysical],
            [$Outer].[costamountposted],
            [$Outer].[dateexpected],
            [$Outer].[datefinancial],
            [$Outer].[datephysical],
            [$Outer].[inventdimid],
            [$Outer].[inventtransorigin],
            [$Outer].[invoiceid],
            [$Outer].[itemid],
            [$Outer].[packingslipid],
            [$Outer].[qty],
            [$Outer].[voucher],
            [$Outer].[voucherphysical],
            [$Outer].[dataareaid],
            [$Outer].[referenceid],
            [$Outer].[referencecategory],
            [$Inner].[configid],
            [$Inner].[inventbatchid],
            [$Inner].[inventcolorid],
            [$Inner].[inventlocationid],
            [$Inner].[inventsiteid],
            [$Inner].[inventsizeid],
            [$Inner].[inventstatusid],
            [$Inner].[inventstyleid],
            [$Inner].[wmslocationid]
        from 
        (
            select [$Outer].[costamountadjustment],
                [$Outer].[costamountoperations],
                [$Outer].[costamountphysical],
                [$Outer].[costamountposted],
                [$Outer].[dateexpected],
                [$Outer].[datefinancial],
                [$Outer].[datephysical],
                [$Outer].[inventdimid],
                [$Outer].[inventtransorigin],
                [$Outer].[invoiceid],
                [$Outer].[itemid],
                [$Outer].[packingslipid],
                [$Outer].[qty],
                [$Outer].[voucher],
                [$Outer].[voucherphysical],
                [$Outer].[dataareaid],
                [$Inner].[referenceid],
                [$Inner].[referencecategory]
            from 
            (
                select [costamountadjustment],
                    [costamountoperations],
                    [costamountphysical],
                    [costamountposted],
                    [dateexpected],
                    [datefinancial],
                    [datephysical],
                    [inventdimid],
                    [inventtransorigin],
                    [invoiceid],
                    [itemid],
                    [packingslipid],
                    [qty],
                    [voucher],
                    [voucherphysical],
                    [dataareaid]
                from [dataverse_production_cds2_workspace_unq239aaf6e46184884942eb81311b62].[dbo].[inventtrans] as [$Table]
            ) as [$Outer]
            left outer join 
            (
                select [$Outer].[inventtransid] as [inventtransid],
                    [$Outer].[referenceid] as [referenceid],
                    [$Outer].[dataareaid] as [dataareaid2],
                    [$Outer].[recid] as [recid],
                    [$Inner].[LocalizedLabel] as [referencecategory]
                from 
                (
                    select [referencecategory],
                        [inventtransid],
                        [referenceid],
                        [dataareaid],
                        [recid]
                    from [dataverse_production_cds2_workspace_unq239aaf6e46184884942eb81311b62].[dbo].[inventtransorigin] as [$Table]
                ) as [$Outer]
                left outer join 
                (
                    select [_].[Option],
                        [_].[LocalizedLabel],
                        [_].[ExternalValue]
                    from [dataverse_production_cds2_workspace_unq239aaf6e46184884942eb81311b62].[dbo].[GlobalOptionsetMetadata] as [_]
                    where ([_].[EntityName] = 'inventtransorigin' and [_].[EntityName] is not null) and ([_].[OptionSetName] = 'referencecategory' and [_].[OptionSetName] is not null)
                ) as [$Inner] on ([$Outer].[referencecategory] = [$Inner].[Option] or [$Outer].[referencecategory] is null and [$Inner].[Option] is null)
            ) as [$Inner] on ([$Outer].[inventtransorigin] = [$Inner].[recid] or [$Outer].[inventtransorigin] is null and [$Inner].[recid] is null)
        ) as [$Outer]
        left outer join 
        (
            select [configid] as [configid],
                [inventbatchid] as [inventbatchid],
                [inventcolorid] as [inventcolorid],
                [inventdimid] as [inventdimid2],
                [inventlocationid] as [inventlocationid],
                [inventsiteid] as [inventsiteid],
                [inventsizeid] as [inventsizeid],
                [inventstatusid] as [inventstatusid],
                [inventstyleid] as [inventstyleid],
                [wmslocationid] as [wmslocationid],
                [dataareaid] as [dataareaid2]
            from [dataverse_production_cds2_workspace_unq239aaf6e46184884942eb81311b62].[dbo].[inventdim] as [$Table]
        ) as [$Inner] on (([$Outer].[inventdimid] = [$Inner].[inventdimid2] or [$Outer].[inventdimid] is null and [$Inner].[inventdimid2] is null) and ([$Outer].[dataareaid] = [$Inner].[dataareaid2] or [$Outer].[dataareaid] is null and [$Inner].[dataareaid2] is null))
    ) as [_]
) as [_]