If you accidentally assign MECA instead of TPS, you can easily change this as long as you have not started the assignment.

First, select the View Account tab and choose Users for the type of account.

Next, choose the user who you would like to change from MECA to TPS or vice versa.

The user’s profile will appear. Choose the MECA from the list of available assignments.

The MECA assignment screen will appear.  All you need to do is change the option for the type of program.  You will be notified if you have to pay more or some credits will be returned to your account.