Qouting myself:
"If you want to guarantee conflicts between plans and specifications, or between different sheets of the plans, then, by all means , repeat dimensions, notes details and other elements !
At first, we may think that repeating things will help to clarify them and emphasize their importance. But there is a trap here which is all too easy to fall into. Consider this common scenario. You are preparing plans for a retaining wall which is to be 10 feet in height. There are several sheets to the plan set and the wall appears on three of them. Each time the wall is shown you dimension and label it using the 10 foot design height. Late in the design process, when deadlines loom and conditions are at their most hectic, you discover that the wall needs to be 12 feet high. So you hastily redesign and change the plans accordingly. But you overlook one of the three sheets ! Now you have created a conflict. Sheet 5 does not agree with sheet 7. Your contractor doesn't know which is correct and you now have the additional duty to correct this error and possibly issue a change order for increased costs. As you know, these are never a welcome sight to your client or employer."
good luck
The best rule here is to say it once and say it correctly. Don't repeat things if you don't have to. Changes always occur and small oversights like this can and will happen.