Hi Mahesh,
Create custom validation ZPO_CONFIRMATION_DELETE.
Go to SPRO
Supply Network Collaboration > Basic Settings > Validation > Own Settings > Maintain Settings in Validation Profiles
Maintain below validation check
Validation Profile= POC3
Validation Check= ZPO_CONFIRMATION_DELETE
Check Status= A-Active
Validation Profile= POC5
Validation Check= ZPO_CONFIRMATION_DELETE
Check Status= A-Active
You to add the logic to delete confirmation when change in quantity for that you need to enhance the BADi method VALIDATE in BADI /SCMB/BOL_VALFRMWRK
Regards,
Nikhil