Using the latest JBDS 5.0 and the attached simplified Model Project Set (Trimtest.zip).

On the view model CCH_V.memmasV change the transformation to [1] and perform a Save/Validate. It will be rewritten to [2] and give a parsing error.

[1]
SELECT
ltrim(Memb.LSTNAM) || ', ' || trim('foo') ||' '|| trim(Memb.MIDNAM) AS MEMBER_NAME
FROM
CCH.MEMMAS AS Memb

[2]
SELECT
((((ltrim(Memb.LSTNAM) || ', ') || trim( FROM )) || ' ') || trim( FROM Memb.MIDNAM)) AS MEMBER_NAME
FROM
CCH.MEMMAS AS Memb