Hello Brett
This kind of issue generallt happens when the preceding operation has been already manually confirmed.
I suggest you to read the information provide on the SAP Help for more details about milestones:
Milestone Confirmation - Production Orders (PP-SFC) - SAP Library
The information below is particularly relevant in this case:
- Operations that have already been manually confirmed are not affected by milestone confirmations.
Operation 30 is marked in its control key as a milestone operation. You partially confirm operation 10 manually with a quantity of 50 pieces. You then finally confirm operation 30 manually with a quantity of 100 pieces. Operation 10 is still partially confirmed with a quantity of 50 pieces; operations 20 and 30 however are finally confirmed with quantities of 100 pieces.
BR
Caetano