This sounds like you have the same column (same mnemonic) twice somewhere, maybe in a schema definition or when setting up a detail view. But in any case, what should happen is that the instrumentbuilder should not accept input with a duplicate column and instead report a compiler error at the correct line telling you about the duplicate. This doesn't seem to happen for you and this is likely a bug in the instrumentbuilder. Can you please file a bug report via Feedback Assitant.? If possible, please include the instrpkg file that is causing this issue or a simplified file that still reproduces the issue.
Topic:
Developer Tools & Services
SubTopic:
Xcode
Tags: