The problem is because you have a list of numbers and you are trying to compare that to a uniqueidentifier.
You insert this into a table.
('101038, 101039, 101040, 101044')
INSERT INTO @Tmp (JobIds)
SELECT CAST(Items AS VARCHAR(40)) FROM InterfaceSystem.dbo.fn_SplitString(@jobid,',')
But then you try to find them in your table. Assuming itt_jobcodeid is a uniqueidentifier you are comparing apples to oranges here. It will attempt to cast your values to a uniqueidentifier and those are not valid values.
and i.itt_jobcodeid in (select JobIDs from @Tmp)
As a side note, I would highly recommend reading the article linked in my signature about splitting strings. It will blow the doors off the while loop splitter.
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Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.
Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/