Do i need Masters degree for Z visa or bachelors?

Hello
I would like to ask my company wants to sponsor me for Z type and they want to process through agencies. Agent is asking for i have to attest my bachelors and masters degree both.

My question is normally embassy requires highest qualifications i.e My highest qualification is Masters degree so in this case do i need to submit bachelors degree also or i can only submit masters degree

Thank you