When transferring cards between projects you may encounter the following warning: Transferring these time cards to this project will cause the project's open and/or close date to be adjusted such that the work dates of the time cards are within the project dates. Do you wish to continue?
Solution
If you do not want the target project's start or end date's to change then click Cancel. Otherwise click OK and the project start or end dates will be modified to allow the transfer. This warning is shown because you cannot submit time cards outside of a project's date range.