# Reference

Look up the fields and statuses of purchase and service orders, receipts, restocks, and returns.

Source: https://support.toolingmetrics.com/en/purchasing/reference/

- [Purchase orders](https://support.toolingmetrics.com/en/purchasing/reference/purchase-orders.md): Purchase order fields, line items, and the status lifecycle — including Service Orders, which are Purchase Orders.
- [Purchase receipts](https://support.toolingmetrics.com/en/purchasing/reference/purchase-receipts.md): Receipt document fields, line availability states, and what validating a receipt updates.
- [Purchase restocks](https://support.toolingmetrics.com/en/purchasing/reference/purchase-restocks.md): Restock document fields and how put-away locations get assigned.
- [Service orders](https://support.toolingmetrics.com/en/purchasing/reference/service-orders.md): How a Service Order differs from a Purchase Order, and the Service Pick document that moves items to the vendor.
- [Purchase returns](https://support.toolingmetrics.com/en/purchasing/reference/purchase-returns.md): Return document fields and how a return relates to the Return Pick.