Availability types are used when checking component availability against work orders. They allow the user to decide how to check availability.
There are three availability types:
Current on-hand balance. This will highlight problems if the requested quantity of parts is greater than what is physically available in the warehouse. This is useful if the work is to be carried out immediately, but may not be appropriate when the work is being carried out in a few days or weeks when the material situation might change.
Projected on-hand balance. This takes into account projections on receipts and other uses. This is particularly useful when planning for jobs in the future, but not for immediate requirements.
Available to promise. This takes into account the on-hand inventory less customers orders that are due and overdue. This is useful for instance when confirming a date of delivery to a customer.