In the third line you say that O12 should not populate until both K27 and I12 have an entry. In the fourth line you say that if K27 is blank and I12 has an appropriate entry, O12 should populate. I am sending this on the assumptions that the fourth line is correct, and that there are only three possibilities for entries in K27 which are "blank", "0000" and a value between "1000 - 1999". I further assume that the only entries for I12 are those listed. If those assumptions are correct then the following formula should work for cell O12.
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