Check 2 different record in Report page

Hi,

i've a report like this:
DATE_KMSTARTKMENDCHECK___

07/04/2014 409379409460 (do something like this: OK)

08/04/2014 409461409731 (...ERROR)

09/04/2014 409731__409870 (...OK)
I need to check if the last value in the first coloum is the same in the next record (Because 409461 is different from 409460).

Any suggestion? <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=22295&image=1&table=forumtopics' class='bbc_emoticon' alt=':unsure:' />