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Try this:
=IFERROR(IFERROR(INDEX($D$1:$D1, MATCH(A2&"-"&C2, INDEX($A$1:$A1&"-"&$C$1:$C1, 0), 0)), INDEX($D$1:$D1, MATCH(C2&"-"&A2, INDEX($A$1:$A1&"-"&$C$1:$C1, 0), 0))), MAX($D$1:$D1)+1)
Try this:
=IFERROR(IFERROR(INDEX($D$1:$D1, MATCH(A2&"-"&C2, INDEX($A$1:$A1&"-"&$C$1:$C1, 0), 0)), INDEX($D$1:$D1, MATCH(C2&"-"&A2, INDEX($A$1:$A1&"-"&$C$1:$C1, 0), 0))), MAX($D$1:$D1)+1)
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Thanks very much for your help. This assigns the a unique pair_ID perfectly.
Is there any way for the formula to also identify the pair further down the spreadsheet to save me having to add everything twice when a line contains the identical ID numbers for both birds and the same year?
For example, imagine columns C and D have no contents and I enter 'EF70113' into cell C2. I would like the formula to search all of column A for 'EF70113' and assuming column B contains '1977' as per line 2, it enters 'ED81312' into column C and also copies the pair_ID of '1' into column D for that corresponding line.
Essentially, as I complete line 2 in the example, line 5 will be completed also.
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