Not sure it it exactly fulfill you requirements, but you can setup the operation with a work guideline of the type Subtask, and you set Sign Off Required = Required to Close Operation.

 Then you mark the operation as a Milestone. This will prevent a greater quantity being reported on the succeeding operations than reported on this operation

@Björn Hultgren thank you, I tried to add to a routing templet but it seems to not work with standard operation? Any suggestions?

Thank you,