Cause: At least one item should be marked as being part of the primary key if one of the following is true:
1. The key mode for the block is either UPDATEABLE_PRIMARY_KEY or NON_UPDATEABLE_PRIMARY_KEY.
2. The key mode for the block is AUTOMATIC but the data source to which you are connected does not support UNIQUE key mode.
Action: Mark one of the items as being part of the primary key and re-compile.