I think your explanation is missing something. Are the dates in column X the first date that the price in column Y becomes effective? I am going to assume yes.
Also, next time please attach your actual Excel file so we have data to work with. It's even easier than taking a screen shot and attaching the image. Few people will take the time to type all of your data from the image into a worksheet.
Let's try this. Conditional formatting rule for column V:
Formula:
=U1=VLOOKUP(V1,X:Y,2,TRUE)
You will probably need this version
Formula:
=U1=VLOOKUP(V1;X:Y;2;TRUE)
I do not know the Swedish words for VLOOKUP and TRUE.
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