The Formal Parameter @ReportingId Was Not Declared As An OUTPUT Parameter, But...what Is This?

After running my ssis pkg for some time with no problems I saw the following error come up, probably during execution of a stored procedure ...

An OLE DB error has occurred. Error code: 0x80040E14. An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80040E14 Description: "The formal parameter "@ReportingId" was not declared as an OUTPUT parameter, but the actual parameter passed in requested output.".

I see some references to this on the web (even this one) but so far they seem like deadends. Doe anybody know what this means? Below is a summary of how the variable is used in the stored proc.

The sp is declared with 21 input params only, none of them is @ReportingId. It declares @ReportingId as a bigint variable and uses it in the beginning of the proc as follows...




Code Snippet
select @ReportingId = max(ReportingId)
from [dbo].[GuidToReportingid]
where Guid = @UniqueIdentifier and
EffectiveEndDate is null

if @ReportingId is null
BEGIN
insert into [dbo].[GuidToReportingId]
select @UniqueIdentifier,getdate(),null,getdate()
set @ReportingId = scope_identity()
END
ELSE
BEGIN
select @rowcount = count(*) from [dbo].[someTable]
where ReportingId = @ReportingId and...lots of other conditions






...later as part of an else it does the following...




Code Snippet
if @rowcount > 0 and @joinsMatch = 1
begin
set @insertFlag = 0
end
else
begin
update [dbo].[GuidToReportingId]
set EffectiveEndDate = getdate()
where ReportingId = @ReportingId
insert into [dbo].[GuidToReportingId]
select @UniqueIdentifier,getdate(),null,getdate()
set @ReportingId = scope_identity()
end






...and before the return it's value is inserted to different tables.