newline in \AddInvoiceItem creates unwanted control sequences in XML

[spi43984]

I'm trying out creating e-invoices with LaTeX and the current version 0.9c of ZUGFeRD.

If adding a newline in \AddInvoiceItem in document.tex, the cretead pdf looks good, but the XML isn't.

\AddInvoiceItem{5}{Rundungstest\break
2. Zeile\break
3. Zeile}{95.38}

This renders a pdf like

But the XML contains something like

Rundungstest\protect \penalty -\@M 2. Zeile\protect \penalty -\@M 3. Zeile

What is the correct way to add newlines into invoice items' descriptions?

[TeXhackse]

Please have a look at the documentation concerning the mechanism to disable macros.

[spi43984]

Thx - do you mean something like \def\break{\ ---\ }in zugferd-invoice.sty?

\newcommand*{\PrintInvoiceItem}[5]{%
        \stepcounter{invoiceitem}%
        \theinvoiceitem%Positionsnummer
        \zugferd_fp_gset_rounded:Nn \g__ptxcd_invoice_item_vat_fp  {#2 * (#1/100) * #4}
        \zugferd_fp_gset_rounded:Nn \g__ptxcd_invoice_item_fp  {#2 * #4}
        \fp_gadd:cn {g__ptxcd_invoice_base_vat#1_fp} {\g__ptxcd_invoice_item_fp}
        \fp_gadd:cn {g__ptxcd_invoice_sum_vat#1_fp} {\g__ptxcd_invoice_item_vat_fp}
        \fp_gadd:Nn \g__ptxcd_invoice_sum_fp {\g__ptxcd_invoice_item_fp}

        % concatenate multiline strings in XML by " --- " to remove \break control sequences
        \def\break{\ ---\ }
        % optionen position nummer name einzel-preis anzahl gesamtpreis
        \zugferd_write_Item:ennnnnn {tax/rate=#1, tax/category=\use:c {__ptxcd_invoice_type_code#1:},#5} {\theinvoiceitem} {} {#3} {#4} {#2} {\fp_use:N \g__ptxcd_invoice_item_fp}
...

[TeXhackse]

that or similar. See the section on “Escaping macros inside XML data” in the documentation. There is an example that adds a newline character though viewers might have issues with that.