Can you forgo a critical success?

[Tectorman]

As the title. If you roll for a success and achieve a critical success, can you (for whatever reason) settle for merely the success result? For example, the Resurrection ritual permanently changes a resurrected being (behavior or appearance) on a critical success, but not on a regular success. Must the resurrector impose such a change on his target, or can he temper how well he does?

[Eltacolibre]

By the rules, the player can't influence the critical success results. At least there are no ways listed to do it.

The only person listed as sometime deciding result of critical success is the GM.

So it's a case of asking your GM.

[Xenocrat]

The Possession spell explicitly allows you to downgrade your success (because you might want the "I just passively ride around in someone's head option for an ally or a total failure rather than partial control of an enemy). This implies that you can't normally do it.