When saving back a project from Microsoft Project (MSP) to PPM, receive error: 'Project Save Failed' due to one or more issues with Start and / or Finish Dates for tasks in MSP.
In the app-ca.logs, you will see the following Warning message 'ImportTaskProcessor.doProcess(): Illegal Task Start and/or Finish dates' related to schedulers.postProject.
Tip: To get to the app-ca.logs, see the following KB that will walk both On Premise and SaaS customers on steps to retrieve the log: KB000113183
There are a couple of causes for this issue, but below is one method to reproduce this issue:
Steps to reproduce:
1. Export a project from PPM to MSP
2. In MSP, go to File->Options and set New Tasks created to Manually Scheduled using the below steps:
a. Click on Schedule on the left hand side
b. Set 'New tasks created' to 'Manually Scheduled'
c. Click OK
2. Create a new task in MSP and leave the Start/Finish Dates blank
3. Attempt to Save the project back from MSP to PPM
Expected Results: Project Saves successfully
Actual Results: Receive error message 'Project Save Failed' and project does not save back to PPM