The following Agenda cards seems OK to me:

- For the Right Price: Play "Wanted" as a forced mission.

- Agents of the Empire: Play "Impounded" as a forced mission.

But the following ones, shouldn't be played as "forced mission" instead of "side mission"?

- Lord Vader's Command: Play this card as side mission "Dark Obsession".

- Retaliation: Play this card as side mission "Breaking Point".

- Imperial Industry: Play this card as side mission "Means of Production".

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Sorry, just found out (Rules Reference p. 4)

That's right. The non-forced missions sit along side the side missions. The rebels can choose to do it instead of one of their side missions. As per the text on the card, if the rebels choose not to do the mission, the card gets discarded and the imperial automatically gets the reward listed on the card.