Screen Exit or Badi for PP Operation confirmation T Code CO12 - Collective Entry

Hello Friends,

We have developed SAP Std T Code, CO12 - Collective Entry for the Field `Reason for Variance',
but the entries done with this fields cannot Save (rest confirmation entries can save).

Reason as per Technical team, there is no `Screen Exit or Badi for PP Operation confirmation T Code CO12 - Collective Entry'

Will be rewarded for proper guidance.

Thanks and regards,

SG