In my Form design, I have a combobox and a grid. The controlsource of the combobox is the client table which has clientID as the primary index. The rowsource and rowsource type of the grid is the order table with the orderID as a unique index and the clientID as a regular index. When I click on the combobox, an error message "uniqueness of index is violated" and the combobox goes blank. Please help me solve this problem.