In the Microsoft Project (MSP) New Driver, dependency lags decrease on the save back to PPM if 'Hours Per Day' is less than 8 Hours.

Steps to Reproduce:

1. Create a project in PPM

2. Go to 'Open in Scheduler' -> 'Microsoft Project [Read-Write]' to open the project in MSP 

3. Go to File -> Options -> Schedule

4. Change 'Hours Per Day' to 7.5
Note: The lower the hours per day, the more the lag decreases in the save back to PPM. Example, if 'Hours per Day' is 6, the lag decreased for the below example by 3 days instead of 1

5. Click OK

6. Create 2 tasks 'Task 1' and 'Task 2'

7. Add the Predecessor column to the view if not there already by right clicking and selecting 'Insert Column'

8. For Task 2's Predecessor column, type '1FS + 10' to add task 1 as a dependency with a 10 day lag

9. Save the project back to PPM

10. Navigate to the Tasks tab in PPM and click on Task 2

11. Select the Properties drop down than Dependencies

12. Observe the results

Expected Results: The lag remains the same (in this example, it remains at 10 days).

Actual Results: The lag has decreased (in this example it has decreased to 9 days). It will continue to decrease on each save back to PPM. If you export the project back to MSP, the lag has has decreased there as well.

This is caused by CLRT-81470/DE32900

This issue applies to CA PPM 14.2 14.3, 14.4, 15.1 and 15.2 with the MSP new driver.

This issue is fixed in CA PPM 15.3.

Workaround: In MSP Options -> Schedule, change 'Hours per Day' to 8.