Work training courses paid for with private account

If you want to reclaim vAT, then yes, but if you are not subject to VAT, then the current invoice is sufficient (because you cannot reclaim vAT in that case).
Paying with your private account is not a problem.
https://dexxter.be/kosten-inbrengen-betaald-from-priverekening-sole proprietor/

Kind regards,
Louise
www.ticenits.be

Thank you for your clear answer, Louise!