Field Service doesn't let me add or edit a contact.

Before continuing, make sure you have already upgraded to the latest version of Field Service that was designed to work with iOS 4.  If you have already upgraded, and are still having difficulty, please continue with these instructions.

Apple has acknowledged problems with using exchange server and iOS 4 that can effect the "Contacts" application, and subsequently can effect how Field service works.

It appears that Apple has fixed this problem with iOS 4.1.  If you can upgrade your OS to 4.1, please do so.  Otherwise, continue with the instructions.

To work around this problem while we wait for Apple to fix it, do the following:

Launch the Settings appliation

Go to Settings-->Mail, Contacts, Calendars

Select your gmail exchange account, or Microsoft exchange account.

Turn off syncing contacts as per the illustration below.

You can still sync your contacts via iTunes.  Click here for instructions about how to do that.

Some have found that they can turn syncing contacts back on after they have run the program at least once with the setting turned off.