Saints Row Ultimate Franchise Pack "You cannot complete your transaction ..."

[DeadSpartanUK]

"You cannot complete your transaction because you are attempting to purchase an item that is already included in another packaged item in your cart. Please check your cart to verify that you are not purchasing an item multiple times. The most common cause would be purchasing DLC along with a deluxe version of a product that already includes the same DLC."

but It's the only item in my cart

[Kesac]

This usually happens when they screw up a package and have the same item twice in the package -- you'll need to contact the publisher in this instance (via the forum most likely).

Judging by the the number of "Saint's Row Ultimate Franchise Packs" listed on steamdb, I'm unsure which one you're trying to puchase.

[RantMike]

In my case this was a problem with the Saints Row 4 items in the pack. To fix this, first I purchased Saints Row 4: Game of the Century Edition, and afterwards bought the Saints Row Ultimate Franchise Pack which now excluded all Saints Row 4 items, I even saved money this way.