Differences were detected in the specified object while you were working on it.
The specified object was changed at the database while you were working on the same object using Visual Database Tools. The most common reason for this error is that another developer (or possibly your database administrator) applied the changes — not realizing you were also working on the same database object.
To correct this error
Click Yes to replace the existing database object.
Click No to keep the existing database object and cancel the current operation.
Click Cancel to keep the existing database object and cancel the current operation.