Missing data after copying a company

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After making a copy of a company, I seem to be missing some data. In the copied company, I am showing 4 past due bills that were paid in the original company. They were paid on 6/1/2012 in the original company. When viewing the paid bills in the copy company it does not list them on that date. Instead, it lists - PrgCstSum0601120001. How can I fix this?