I don't think they should differ and in my result, they don't. But it still generates this error. I am not sure why I see this error when sp1 and sp2 are equal. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://d3s.mff.cuni.cz/pipermail/nswi004/attachments/20201013/cb2e70ac/attachment.htm>