MSP: Duplicate Task ID found error when attempting to save project back to PPM

Document ID : KB000102860
Last Modified Date : 20/06/2018
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Issue:
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. 
Cause:
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. 
Resolution:
To resolve these errors, delete or replace any duplicate data from Text1. 

To do this:
1. In MSP from a Task or Gantt view, add the Text1 column to the view
2. Make sure that the WBS task list is expanded in MSP to show all tasks
3. Replace or remove any duplicate data found in Text1

Notes::
  • If the data being replaced is not Task ID related data that is being maintained in the project, the values can be moved to another Text field not currently in use for mapping (Text1, Text2, and Text3 are PPM reserved fields used in mapping).
  • Also ensure the character length of the Task IDs are less then or equal to 16 characters or another error can occur. See KB000100103 for more details on this issue.
Additional Information:
Reference KB000100103 - MSP Errors: Invalid Name for field prexternal ID due to Text1 field data exceeding 16 characters in length. 
Reference KB000010395 - CA PPM Best Practices when copying and pasting tasks in MSP that provides an overview of Text1, Text2, and Text3 in mapping to PPM. 
Reference KB000071385 - CA PPM and MSP integration - List of Knowledge Documents
Reference KB000015956 - CA PPM and MSP integration known defects - Support Technical Document Index