Just like in the application, a document can also be copied via the REST API interface.
Example:
<winstrom version="1.0">
<skladovy-pohyb sourceId="1179">
<datVyst>2022-09-11</datVyst>
</skladovy-pohyb>
</winstrom>
Where sourceId corresponds to the ID of the record being copied. The datVyst attribute will be assigned to the newly created record.