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level 1 and 2 pricing?

Sam4s sps500 series register in my bar. It was set up with level 1 and level 2 pricing. Level 1 to start at 6:00 and end at 18:00. Level 2 to start at 18:00 and end at 6:00. For some reason it is not changing. Any suggestions?
Michelle, May 2012