I received some very positive feedback from the Notes application support group at the company where I experienced the LSX error. They confirmed that the error was confined to Domino servers running code prior to 6.0.3. Interestingly enough, they were able to get my code to run just fine by commenting out the line where the error was being generated:
Call con.Action ( LCACTION_TRUNCATE )
So, I guess I have to figure out if I want to rewrite this statement as a while loop that deletes all existing record in the tables one at a time. Yeesh.
The support group also let me know that Domino 6.0.3 and 6.5.2 use a new LC LSX API. When I didn't see anything on this in the 6.0.3 Release Notes. I asked them how they knew this. They replied that they learned this when speaking with a Lotus rep on an unrelated DB2 LSX issue.