In KNIME 3.1.0 (and perhaps other versions as well, didn't verify), the "Column List Loop Start" fails to "enforce exclusion" of columns when kept inside another loop.
In my case that's a "Group Loop" (GL) as per sketch below (CLL = Column List Loop).
<GL> -- [Transpose] -- <CLL> -- </CLL> -- </GL>
The surrounding GL runs through OK *once*, but when the colum set changes after the next group/transpose op, the "enforce exclusion" just stops the flow.
Error message per log: "Input table does not contain the following required included column(s):" - thing is, I have enforced *exclusion*, not *inclusion*.
Please do fix!