extra tables created by navision in sql 2005

hi, when i look my tables created by navision, i got some numbers for ABC$Cust_legder entry, another table is like this ABC$Cust_legder_entry_1000000021( i have sooo many tables in sql server 2005)(but there is no data inside) previously it was not there… what is happening… Navision 4.0 SP3 is working fine any ideas thanks

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