Glossary
What is an inventory cap?
An inventory cap limits how many of a package can be sold or issued. It is optional. When set, it is enforced against the ledger rather than a counter that can be edited, so the number sold and the number recorded always agree.
A cap is how a venue sells something genuinely limited without overselling it.
Enforced through the ledger
Consumption is a ledger entry, not a decrement on a field. That is what makes the count defensible when somebody asks how many were actually sold.
Corrections are recorded, not silent
Releasing or correcting used inventory requires the right permission and an explicit operator note. There is no control anywhere that changes inventory without leaving a record.