Hello, Thanks once again for the information.
Your solution is to remove the symbol itself. But I just need to delete some quotes in a symbol. For eg., please have a look at this screenshot: http://img93.imageshack.us/img93/2304/deletequotetw7.jpg The scrip IndiaCem.NS has some invalid quotes with o=h=l and volume = 0. I need to delete only those quotes, and not the entire IndiaCem.NS symbol itself. Thank you, Praveen.
