SSRS Highlight Duplicate Values in Column Across Entire Report - sql-server

Question

I have an SSRS report that looks at products used in a bill of materials. It lists the items involved, the bill of materials (BOM) they belong to and other various information. I would like to highlight ANY duplicates in the item column without having to sort by item.
Example data:
Level
Item No.
BOM No.
Quantity Per
1
001468
017998
4
1
001850
017998
6
1
017663
017998
2
1
017792
017998
2
2
001468
017663
3
So in the above data, the item # "001468" should get highlighted even though the information in the other columns is different per row.
I am aware of the "Previous" function but I don't want to re-order the item number column so I don't think using that is an option
The report sorts by level so that it first lists all the items in the top level (level 1) followed by the lower levels (2, 3, 4 etc...)
There can be multiple duplicates (not just 2), so any solution will have to factor that in
Would like the duplicate(s) too be highlighted in Bold Red
If more information is needed please let me know.
Edit: More Details added below 08/05/2022
Here is the code I am working with which begins with a recursive CTE:
WITH CTERBOM AS
(
SELECT PBL.[Production BOM No_], PBL.[Version Code], PBL.[No_], PBL.[Quantity per], 1 AS LVL
FROM [DataBaseName$Production BOM Line] PBL
LEFT JOIN [DataBaseName$Production BOM Header Extra] PBHEX ON PBHEX.[No_] = PBL.[Production BOM No_]
WHERE PBL.[Production BOM No_] = '008722' AND PBHEX.[Active Version No_] = PBL.[Version Code]
UNION ALL
SELECT PBL2.[Production BOM No_], PBL2.[Version Code], PBL2.[No_], PBL2.[Quantity per], LVL + 1
FROM [DataBaseName$Production BOM Line] PBL2
INNER JOIN CTERBOM ON CTERBOM.[No_] = PBL2.[Production BOM No_]
)
SELECT
CTERBOM.[LVL] AS [Level],
CTERBOM.[No_] AS [Item No.],
CTERBOM.[Production BOM No_] AS [Production BOM No.],
CTERBOM.[Quantity per] AS [Qty. Per]
FROM CTERBOM
LEFT JOIN [DataBaseName$Production BOM Header Extra] PBHEX ON PBHEX.[No_] = CTERBOM.[Production BOM No_]
GROUP BY
CTERBOM.[LVL],
CTERBOM.[Production BOM No_],
CTERBOM.[No_],
CTERBOM.[Quantity per],
ORDER BY
CTERBOM.[LVL],
CTERBOM.[Production BOM No_],
CTERBOM.[No_]

Answer 1

One way to do this would be to do add a new column to the query, as duplicates = count(*) over (partition by [Item No.]) (insert your actual column name).
Then use that to conditionally highlight the Item No field in the report if the value of the duplicates column is > 1. You would do this by going to the Item No field in the report > properties > fill > fill color > press the expression button and enter something like:
=IIf(Fields!duplicates.Value > 1,"Yellow","Default")
Add this column to your final select:
-- APPROACH 1:
SELECT
CTERBOM.[LVL] AS [Level],
CTERBOM.[No_] AS [Item No.],
count(*) over (partition by CTERBOM.[No_]) as duplicates,
/* ... */
/* APPROACH 2:
if you can't use approach 1 because of other code not currently
shown in the question, you can wrap the entire select in
another select, which will always work:
*/
WITH CTERBOM AS
(
SELECT PBL.[Production BOM No_], PBL.[Version Code], PBL.[No_], PBL.[Quantity per], 1 AS LVL
FROM [DataBaseName$Production BOM Line] PBL
LEFT JOIN [DataBaseName$Production BOM Header Extra] PBHEX ON PBHEX.[No_] = PBL.[Production BOM No_]
WHERE PBL.[Production BOM No_] = '008722' AND PBHEX.[Active Version No_] = PBL.[Version Code]
UNION ALL
SELECT PBL2.[Production BOM No_], PBL2.[Version Code], PBL2.[No_], PBL2.[Quantity per], LVL + 1
FROM [DataBaseName$Production BOM Line] PBL2
INNER JOIN CTERBOM ON CTERBOM.[No_] = PBL2.[Production BOM No_]
)
select level,
[Item No.],
count(*) over (partition by [Item No.]) as duplicates,
[Production BOM No.],
[Qty. Per]
from (
SELECT
CTERBOM.[LVL] AS [Level],
CTERBOM.[No_] AS [Item No.],
CTERBOM.[Production BOM No_] AS [Production BOM No.],
CTERBOM.[Quantity per] AS [Qty. Per]
/* rest of existing query ... */
) t;