CS4 Gradient map in CMYK mode bug (program error)

Hi,
when using gradient map or gradient map adjustment layer in cmyk mode, colors values after apply are different from values that i entered,
for example:
entering:
C=0
M=0
Y=0
K=100
after apply on image, read values are like from RGB:
C=77
M=75
Y=62
K=81
Importing file with gradient map from cs3 are ok until i click on the adjustment layer.
I have catalog printed with this bug and colors was printed bad!
Please help with this!

I know this already!
Question is how to do it correct? I think it's CS4 internal error and it's quite important bug for cmyk workers.
Maybe development team will interest with this?
It's more dangerous in dtp and catalogues, brochures etc. printing.
I had troubles with this error when printed ~1k borchures - client didn't accept this.

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