I found that merged cells can contain multiple values.

Steps to reproduce:

Type 1,2,3,4 in a1:d1
type sum(a1:d1) in e1

Select a1:b1 and merge
Warning : MultipleData, overwrite?
Say yes to merge

Select the merged a1:b1 cells
Copy
Select c1
PasteSpecial Formats

No warning.. no overwrite.

c1:d1 are now merged
BUT d1 still contains a value...
and the SUM of a1:d1 = 8 !!

Also happens with FormatPainter etc
Behaviour observed in xl97,xlXP and xl2003

Error checking will find no fault in the sheet...
and you can spend ages to find out WHY your cross
sums dont match!

(although now that i found this behaviour I'll might
have some use for it...)


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