Help! Project Tasks won't allow us to modify Time Constraint to "Start ASAP"

[Grace Ditsworth]

We're new-ish to ServiceNow PPM and are working to implement the Planning Console and Project Tasks to log our Work Breakdown Structures. However, we're bumping into issues that make this tool impossible to use.

• Cannot change Project Task “Time Constraint” from “Start on specific date” to “Start ASAP.” Defaults to “Start on specific date” and field is locked
  
  
• Only situation where we have been able to modify Time Constraint field is when Project is created as Project, saved, but have not clicked “Start Project”
  
  
• When we create a Demand and then create a Project from the demand, even if the Project is not started, we encounter the problem with the “Time Constraint” field being locked
  
  
• We also want to know if it’s possible to change the Project’s Calculation feature from Manual to Automatic after Project creation. This field disappears from the Project form once the Project is initially created and it does not appear that there is an option to edit it.
  
  
• This is causing us issues because we cannot effectively use the Planning Console to construct a Work Breakdown Structure with automatically calculating dependencies (e.g. Start-to-Finish) unless we are able to create Project Tasks with the “Start ASAP” Time Constraint. If Project Tasks are created with “Start on Specific Date,” all automatic calculation is overrided by the listed date.

[Miguel Donayre]

It's really up to you and the risk you are assuming. You have to remember to turn it back on and hope it works. 

1500 tasks, there might be a lot of room for error, but if it cuts down on man-hours, I would give it a shot. 

[ann-stepp]

I have a similar issue. Calculation is set to Automatic.

It will not allow me to change a constraint type on a task to "no later than" - when I do, and then change the end date to a later date, it changes the constraint type to start no earlier than.