Admiral Piett

When a ship resolves Commander Beck‘s ability to resolve a command as if a command token was spent, it may resolve Admiral Piett’s ability to resolve that command as if a command dial was spent instead.

Reference

When only a command token is spent, you may exhaust Admiral Piett to turn the token into a dial instead. Since you are already spending a token to resolve the command, you cannot also then spend another token of the same command.

No Command Token changed by Piett into Dial allows for another Token of the same command to be spent.

Admiral Piett, if equipped to an Interdictor (equipped with the Interdictor title), can be chosen to become unexhausted, for a second use.

Admiral Piett does not grant the SSD an additional token from changing a command token into a dial, as the dial is not “revealed”. Which is how the SSD gains the token, from a “revealed” dial.

In regards to how a token is “spent” and what part of that command is resolved.
The process is complicated, provided is an example:

For this example, we will use a Super Star Destroyer equipped with Admiral Piett, Wulff Yularen, Director Krennic and Ravager. The SSD has a concentrate fire token already.

Later in the activation, the SSD attacks a target. During the attack step, which is when you can choose to resolve a concentrate fire command. You decide you want to use Admiral Piett ability for this attack.

You must “SPEND” only a token in order to use Admiral Piett ability.

The concentrate fire token has been “spent”, but it has not yet resolved its command because you haven’t done any modifying effect to the attack pool (neither added a die or rerolled a die).

You may exhaust Wulff Yularen, and regain the token, as you “spent” the token.

Exhaust Admiral Piett, you now exchange the “spent” token “If you do, that ship resolves that command as if it had spent a dial of the same type instead.”

This has now changed the token INTO a dial. It is no longer a token, it is now a dial.

Per RRG:

“If a dial, token, die, or other component is spent as part of a cards effects cost, that component does not also produce its normal effect.”

Meaning when you spent that token, and then used Admiral Piett ability on it. You are not producing its normal effect, as the card effect has changed it. In this case, from a token, into a dial.

However, you still, have not yet resolved its command because you haven’t done any modifying effect to the attack pool (neither added a die or rerolled a die).

You now resolve the concentrate fire command AS a Dial. As only a Dial is being “spent”. Thus the Concentrate fire command only resolves its dial effect, and cannot resolve its token effect. Because the token was changed into a dial.

Thus Director Krennic can only use his ability as it relates to the Concentrate Fire Dial, and not also the Token. As no token was spent, a dial was spent. That is why also Ravager cannot add or reroll a die, because no token concentrate fire was resolved, only a dial.