(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?
(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.
You should always zero fill in P6.
For example, a WBS code should be DAM.3.4.01 not DAM.3.4.1
Just overtyping the WBS code with the new zero filled values should sort it