Make value set number unique and numbering can occur automatic when creating value sets.
Currently you can accidentally assign 2 different value labels to the same number say=1, the system does not warn and this very dangerous during analysis you can have wrong statistics
This is actually deliberate. If you do this, you'll note that when you run your program (if it's a tabulation application), you'll have an .ERR file that warns about overlapping value sets. The reason that it is deliberate is that you might want to create a value set like this for age:
The same value appears in multiple values, but makes sense because the values overlap (elderly are a kind of adult). Sometimes it is not something that you would like, as you have discovered, but it's supported because it can be useful.
