Unfortunately no. It is important that when working on a plan collaboratively you establish a clear, common understand around authority for updating or changing the data in the OHPP. Once data has been entered or changes have been made you cannot undo/go back.
It is also recommended that to alleviate potential issues related to multiple users that you: (a) establish a common practice of downloading and saving a full copy of the plan each time you update it, and (b) establish a naming convention each user will apply when saving the downloaded document to serve as a method of version control (for example: DocumentName_DayMonthYear_Time).
In using this practice you can refer back to previous versions and make revisions as warranted.