In FlexiCapture 12 for Invoices while performing a check of an Invoice Document Definition an error pops up:
There is no default country selected
The default country is not selected for the given Document Definition
Default country can be selected in the Document Definition Properties > Document Definition Settings > Countries and Languages > Edit > select the country and set as default
FlexiCapture will use the default language/country in case all other selected options are not relevant for the particular recognition case.