Cube Routine issue

Hi Guys

Here is the problem, I have an update rule its has Charecteristic "Customer Number". The file coming in has customer numbers obviously. A few customer number coming in are correct which should go through and few are not correct. Now i should run a validation to accept the correct number and if there are any wrong customer number i shuld update it with the new number given.

I need to write a routine which does this validations. Could some one help me with the code ASAP.

Regards

Chris