SSRS and ignored "having" clause - sql-server

Question

I'm trying to get a list of data whose last update date is older than the current date minus x month.
As an example, here is a sample table :
| DataGUID | UpdateDate |
|------------|---------------|
| AAA | 12-05-2017 |
| BBB | 22-06-2017 |
| AAA | 14-02-2017 |
| BBB | 16-05-2017 |
Currently, I have a SQL request looking somewhat like the following :
SELECT
DataGUID,
MAX(UpdateDate)
FROM
Table
GROUP BY
DataGUID
HAVING
MAX(UpdateDate) <= DATEADD(mm, CAST('-'+#LastUpdatedXMonthAgo AS INT), GETDATE())
ORDER BY
MAX(UpdateDate) DESC;
Expected result is the following (with #LastUpdatedXMonthAgo = 1, and current date 13-07-2017) :
| DataGUID | UpdateDate |
|------------|---------------|
| AAA | 12-05-2017 |
It works on SSMS, but SSRS seems to ignore the "having" clause, and gives me this result :
| DataGUID | UpdateDate |
|------------|---------------|
| BBB | 22-06-2017 |
| AAA | 12-05-2017 |
Seem like SSRS just ignore the "having" clause, is there a way to make it work without using SSRS filters?

Answer 1

The problem appears to be that you are trying to prepend concatenate a hyphen to a session variable which is a number. This is resulting in the minus sign being ignored/dropped. Hence, your HAVING clause is working, but it is comparing each max date against one month in the future from now, instead of one month behind.
The following query will show you one way to fix this problem:
DECLARE #LastUpdatedXMonthAgo INT;
SET #LastUpdatedXMonthAgo = 1;
SELECT
DATEADD(mm, CAST('-'+CAST(#LastUpdatedXMonthAgo AS VARCHAR(55)) AS INT), GETDATE());
This approach is to cast #LastUpdatedXMonthAgo to text before trying to "negate" the string. Another approach would be to just make #LastUpdatedXMonthAgo text, but maybe this would be inconvenient for the rest of your script.
Update:
In SSMS, we could simplify this even further to:
DATEADD(mm, -#LastUpdatedXMonthAgo, GETDATE());
Demo here:
Rextester