Products > PSOP > Documentation I didn't export the PSOP schedule. Why did the schedule in P3e change? Before the PSOP leveler can run, it is necessary to run the Primavera scheduler. This modifies the Primavera schedule. If the PSOP schedule is not exported, the schedule produced by the P3e scheduler will be left in the database. If you want to preserve your schedule, you should back it up prior to running PSOP. Exporting the project to a file prior to running PSOP is one easy way to make a backup. Back to FAQ