run-time error 2147467259 (80004005)

i have a store that is getting the run time error above only when they have a transaction involving the members of one matrix, and then they are kicked out of the system. if they try to sell one of these items, transfer it to another store, receive it, etc, it will kill the program and give this error. the rest of the information given in the error is "could not find the index entry for RID '1600002bd2765100' in index page (1:42599), index ID 8, database GFANC03. Does anyone have any ideas on the cause of this problem and possible solutions? We are using version 1.2, single lane, muti-store with HQ and this is only occuring at one location. Thanks for any help anyone may be able to provide!