SYMPTOM:
In Strategy Object Manager 9.4.x-10.x, user receives the following error when attempting to migrate a report object from source to destination project.
Object Manager API
The requested object with id xxx and type 12 (Attribute) does not exist in the object context.
However, when searching for the object ID shown in the error text in the source project, the object returned is a prompt (type 10) instead of the an attribute (type 12).
CAUSE:
One possible cause of the error is the report object being migrated has become inconsistent in the source project.
ACTION:
Contact Strategy Technical Support for further assistance on this issue. In order to track down the cause of the inconsistency, customers encountering this issue should make note of related object manipulations, object migrations, or error messages prior to experiencing the problem. Change Journaling, if it has been enabled, can help in preserving this information.