Need KOMA-Script scrbook help

[Rich Shepard]

Environment: lyx-2.3.6.1, TL2023.

I've been using KOMA-Script report, article, and letter2 classes for years
and all work flawlessly.

After examining available LaTeX frameworks for a book I'm converting from a
monograph I've settled on the KOMA-Script book class; and I've read the
scrguideen.pdf Part I. But, it's not working as expected. If there's a more
appropriate source for KOMA-Script help please point me to it.

The minimal (non)working example .lyx and .tex files are attached.

Problem 1: \mainmatter is enclosed in \begin{quote} and \end{quote}. I don't
see why. \frontmatter isn't and \backmatter in the book itself aren't so
constrained.

Problem 2: When I try to compile the mwe.lyx using pdflatex it fails with an
error involving 'data' which is not present. The book from which the mwe was
extracted has no problems producing a PDF using pdflatex.

Regards,

Rich
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#LyX 2.3 created this file. For more info see http://www.lyx.org/
\lyxformat 544
\begin_document
\begin_header
\save_transient_properties true
\origin unavailable
\textclass scrbook
\begin_preamble
\usepackage{mathpazo,amssymb}
\usepackage{graphicx,relsize}
\usepackage{scrlayer-scrpage}
\pagestyle{scrheadings}
\usepackage{lipsum}
\end_preamble
\use_default_options false
\maintain_unincluded_children false
\language english
\language_package default
\inputencoding auto
\fontencoding global
\font_roman "palatino" "default"
\font_sans "uop" "default"
\font_typewriter "lmtt" "default"
\font_math "auto" "auto"
\font_default_family rmdefault
\use_non_tex_fonts false
\font_sc true
\font_osf false
\font_sf_scale 100 100
\font_tt_scale 100 100
\use_microtype false
\use_dash_ligatures false
\graphics default
\default_output_format pdf2
\output_sync 0
\bibtex_command biber
\index_command default
\paperfontsize default
\spacing single
\use_hyperref false
\papersize executivepaper
\use_geometry false
\use_package amsmath 1
\use_package amssymb 1
\use_package cancel 0
\use_package esint 0
\use_package mathdots 1
\use_package mathtools 0
\use_package mhchem 1
\use_package stackrel 0
\use_package stmaryrd 0
\use_package undertilde 0
\cite_engine biblatex
\cite_engine_type authoryear
\biblio_style plainnat
\biblatex_bibstyle authoryear
\biblatex_citestyle authoryear
\use_bibtopic false
\use_indices false
\paperorientation portrait
\suppress_date true
\justification true
\use_refstyle 0
\use_minted 0
\index Index
\shortcut idx
\color #008000
\end_index
\paperwidth 6in
\paperheight 9in
\leftmargin 0.75in
\topmargin 0.9in
\rightmargin 0.75in
\bottommargin 0.9in
\secnumdepth 3
\tocdepth 3
\paragraph_separation indent
\paragraph_indentation default
\is_math_indent 0
\math_numbering_side default
\quotes_style english
\dynamic_quotes 0
\papercolumns 1
\papersides 2
\paperpagestyle headings
\tracking_changes false
\output_changes false
\html_math_output 0
\html_css_as_file 0
\html_be_strict false
\end_header

\begin_body

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
frontmatter
\end_layout

\end_inset


\end_layout

\begin_layout Title
Document Title
\end_layout

\begin_layout Subtitle
And the sub-title
\end_layout

\begin_layout Author
A.N.
 Author
\end_layout

\begin_layout Standard
\begin_inset CommandInset toc
LatexCommand tableofcontents

\end_inset


\end_layout

\begin_layout Standard
\begin_inset FloatList figure

\end_inset


\end_layout

\begin_layout Standard
\begin_inset FloatList table

\end_inset


\end_layout

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
addcontentsline{toc}{chapter}{Preface}
\end_layout

\end_inset


\end_layout

\begin_layout Chapter
Preface
\end_layout

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
lipsum[19-21]
\end_layout

\end_inset


\end_layout

\begin_layout Quote
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
mainmatter
\end_layout

\end_inset


\end_layout

\begin_layout Chapter
Introduction
\end_layout

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
lipsum[3-9]
\end_layout

\end_inset


\end_layout

\begin_layout Section
First intro section
\end_layout

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
lipsum[1-2]
\end_layout

\end_inset


\end_layout

\begin_layout Section
Second intro section
\end_layout

\begin_layout Standard
\begin_inset ERT
status open

\begin_layout Plain Layout


\backslash
lipsum[42-47]
\end_layout

\end_inset


\end_layout

\end_body
\end_document
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