Hi, Was trying to use your DB and I found what I think it's a data incoherence... When you list the rules, i suppose that they must be in chronological order, I'm assuming that* (X) rule start date always smaller than (X+1) rule start date*, for instance: R Q 1967 o - Ap 8 0 1 D R Q 1967 1968 - S Su>=8 0 0 S R Q 1968 o - Ap 14 0 1 D R Q 1969 1977 - Ap lastSu 0 1 D R Q 1969 1971 - O lastSu 0 0 S R Q 1972 1974 - O 8 0 0 S R Q 1975 1977 - O lastSu 0 0 S I fund in the Haiti rules the following section: R HT 1983 o - May 8 0 1 D R HT 1984 1987 - Ap lastSu 0 1 D R HT 1983 1987 - O lastSu 0 0 S According to my assumption, to keep DB coherence, we should have, in 2nd position something like: R HT 1983 o - O lastSu 0 0 S Am I right or is it some particularity that I didn't understand? Best Regards. Américo Mendes <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaig...> Sem vírus. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaig...> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>