I'm getting the following error in
SSRS, and it's been puzzling me a while now:
An error occurred while the query design method was being saved. An item with the same key has already been added
What does an "item" denote, though? I even tried editing the
RDL and deleting all references to the Stored Procedure I need to use called
Could this possibly have to do with the fact that the Stored Procedure uses Dynamic SQL (the
By the mornin, in the stored procedure I have:
SET @SQL += N' SELECT bi.SupplierID as ''Supplier ID'' ,bi.SupplierName as ''Supplier Name''
,bi.PID as ''PID'' ,bi.RespondentID as ''Respondent ID'' ,lk_slt.Name as ''Entry Link Type'' ,ts.SurveyNumber as ''Initial Survey ID'''
It appears that SSRS has an issue(at leastin version 2008) - I'm studying this website that explains it
Where it says if you have two columns(from 2 diff. tables) with the same name, then it'll cause that problem.
SELECT a.Field1, a.Field2, a.Field3, b.Field1, b.field99 FROM TableA a JOIN TableB b on a.Field1 = b.Field1
SQL handled it just fine, since I had prefixed each with an alias (table) name. But SSRS uses only the column name as the key, not table + column, so it was choking.
The fix was easy, either rename the second column, i.e. b.Field1 AS Field01 or just omit the field all together, which is what I did.