New REJECT button similar to REJECT button in MDG-M

Hi Experts,

                   Hope you are doing well. I have this issue in MDG-M(BRF Plus) workflows, Please help me.

Details:When approver clicks standard REJECT Button, it gives this following error message.

"Create a Note and specify a reason for rejection the change request - Display Help".

Similarly we need same functionality for new buttons given below which are added to New Approval step.

Reject to Predecessor.

Reject to Requestor.

I added these 2 buttons,but I could not able to provide error message similar to REJECT button.

Please help me.

Thanks,

Balaji.T.