Query - Page 36 says of scrolls "They can only contain Phrases, not Sigils or Ceremonies." but page 37 gives costs and description for scribing sigils and ceremonies.
It gives the costs for converting them to Phrases in order to scribe them. Two paragraphs before the table of costs on Page 37 it says, “Phrases are easy enough to transcribe onto paper, but distilling a complex Ceremony down into a form able to be scribed and cast as a Phrase is costly.”