When attempting to save a Microsoft Project (MSP) project back to PPM, receive error:
Duplicate task ID [Project Manager] found. Cannot continue save.
Note: You may see this error multiple times on the save back to PPM when clicking OK.
This error is due to duplicate data being stored in Text1 which is mapped to the Task ID field in PPM. The values in this field must be unique in the project. One reason this can happen is if tasks are copied and pasted using the task highlight feature. This copies over all column data whether visible in the task view or not.