I have a worksheet where in i have allowed data entry in only 2 columns of the sheet. Whats required is when data is typed in any cell of these columns i should not be able to move anywere else without entering some data in the adjacent cell. For example if Col A and Col B are the two columns where data needs to be entered. Then lets say if I type something in A2 then i should be forced to type something in B2. I can leave both the cells blank but if I type in one cell then I have to type some data in the adjacent cell.