Problems with Navision 3.56A

Hi,

We are having problems with Navision 3.56A. The program comes up with the error message "productgroup 99 does not excist". We do not have any product group with this number. This happens when we try to automatically empty todays sales on the cash register. Does anyone know what could be the problem or help me solve this? Any suggestions would be most appreciated. [8D]
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