Arithmetic overflow error converting expression to data type int message in T-SQL code - type-conversion

Question

I have the following code:
SELECT
ehrprg.ReportName
,ehrprg.AnnualGoalServiceMinutes
,COUNT(DISTINCT ct.[ClientFK]) AS [UnduplicatedClients]
FROM
[WH].[Fact].[EHRClinicalTransaction] ct
INNER JOIN [Dimension].EHRProgram ehrprg ON
ct.ProgramFK = ehrprg.WHID
WHERE
ehrprg.AnnualGoalServiceMinutes > 0
GROUP BY
ehrprg.ReportName
,ehrprg.AnnualGoalServiceMinutes
ORDER BY
ReportName
and result:
But I need it would have only one 'SM NV'(instead of 2) and one 'SM REACH' (instead of 3) rows in the [ReportName] column, summarizing [ServiceMinutes]
When I use SUM(ehrprg.AnnualGoalServiceMinutes) it gives me "Arithmetic overflow error converting to datatype int" error.
Then, I tried ,SUM(CONVERT(BIGINT, ehrprg.AnnualGoalServiceMinutes)), but getting the following:
It is still not grouping (not summarizing AnnualGoalServiceMinutes) and gives some values, I can't understand
My goal is to see instead of-
ReportName AnnualGoalServiceMin
SM NV 197885
SM NV 348654
SM REACH 40000
SM REACH 80000
SM REACH 380000
I expect the SUM of the AnnualGoalServiceMin:
ReportName AnnualGoalServiceMin
SM NV 546539
SN REACH 500000
Please, help

Answer 1

I don't know the source of the overflow error (it should not be happening based on the magnitude of the integers invovled), but I think what you need here is a second level of aggregation:
WITH cte AS (
SELECT
ehrprg.ReportName,
ehrprg.AnnualGoalServiceMinutes,
COUNT(DISTINCT ct.[ClientFK]) AS UnduplicatedClients
FROM [WH].[Fact].[EHRClinicalTransaction] ct
INNER JOIN [Dimension].EHRProgram ehrprg
ON ct.ProgramFK = ehrprg.WHID
WHERE ehrprg.AnnualGoalServiceMinutes > 0
GROUP BY ehrprg.ReportName, ehrprg.AnnualGoalServiceMinutes
)
SELECT
ReportName,
SUM(AnnualGoalServiceMinutes) AS AnnualGoalServiceMinutes,
SUM(UnduplicatedClients) AS UnduplicatedClients
FROM cte
GROUP BY
ReportName;