Occupational maternity repayments net or gross

I have to repay the occupational maternity, not statutory maternity pay, due to a claw back clause in my contract. Employer is asking for it back in gross, but I received payments in net from August 2023- May 2024 (PAYE )I'm salaried employee and have 2 months notice period after maternity leave, where employer will claw back part of the pay that I owe from last two wages and a repayment plan for the remaining amount after I've left the company. Should I repay net amount?

Hi ,
 

We are unable to advise how the tax and NIC is claimed back in this forum .

Thank you .