In general, when using the Fixed Loading Pattern, ETC will be dropped from dates before the Actual Thru Date.
However there are some scenarios where you can enter ETC in the previous week and it will stay until the post timesheet job runs again.
This can happen when manual financial transactions are created and then imported back to the assignments.
When timesheets post, the actual thru date becomes the first day of the next timesheet week which causes the ETC from the prior week to drop as expected. Even if you enter ETC in the prior period, the time slice job will drop it.
However, when a manual transaction is imported back the Actual Thru Date becomes the TRANSDATE which is usually not the same as the time period dates.
When this happens the ETC can get entered in the previous week and it will stay there until timesheets post again.
Here is an example:
Advise users not to enter ETC in previous week if the actual thru date does not match the time period finish date.