Docuware supports some EU variants of e-Invoicing.
Please add support variant for Czech Republic called ISDOC
https://www.mvcr.cz/isdoc/
https://cs.wikipedia.org/wiki/ISDOC

ISDOC is also like others based on XML.
It can be 3 types:
XML file with extension (suffix) *.isdoc
XML file with attachment (archived in ZIP) and extension *.isdocx
PDF file with embedded XML data, extension *.pdf

Extension ISDOC is similar to XRechnung variant.
Extension PDF is similar to ZUGFeRD.

Suppliers can choose if they send to customer *.isdoc or *.isdocx or *.pdf.
If supplier sends ISDOC compatible invoice, most of them use *.isdoc (some use *.pdf with embedded XML data).
Currently Docuware cannot processing that files.

Tested with Docuware v7.11 Document processing, I can import PDF file with embedded XML data but receive error from Recognition Service.
I cannot import *.isdoc file because Document processing know only PDF or XML extension. But if I rename *.isdoc file to *.xml I can import it and manually match XML data for processing.