MSP Errors: Invalid Name for field prexternal ID or Duplicate task IDs due to invalid data in Text1 field

Document ID : KB000100103
Last Modified Date : 04/06/2018
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When attempting to save a Microsoft Project (MSP) project back to PPM, receive one or both of the following errors: 

Error 1: Invalid value for field prExternalID [Project Manager, Development Manager].
Error 2: Duplicate task ID [Project Manager] found. Cannot continue save.
Note: You may see these errors multiple times on the save back to PPM when clicking OK. 
These errors are due to invalid or duplicate data being stored in Text1 which is mapped to the Task ID field in PPM.

The values in this field must be: 
  1. Unique in the project, otherwise you will see the following error:
Duplicate task ID [Project Manager] found
      2. Less than or equal to 16 characters, otherwise, you will see the following error 
Invalid value for field prExternalID [Project Manager, Development Manager]
To resolve these errors, move any data from Text1 to another Text field not currently in use for mapping (Text1, Text2, and Text3 are PPM reserved fields used in mapping).

Note, make sure that the WBS task list is expanded in MSP to show all tasks when clearing out the Text1 data. 
Additional Information:
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