Indeed, you should use the TT syntax, but not both :)

Can you try the following instead:
[%- USE Price -%]
[%  order | $Price %]

You certainly need to loop on "orders" before.

On Wed, 24 Oct 2018 at 12:08 Holger Meissner <Holger.Meissner@hs-gesundheit.de> wrote:
Thank you, Barton!

[%- USE Price -%]
[% <<aqorders.listprice>> | $Price %]

did the trick :)
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