Explanation
Oracle Fusion Purchasingprovides the following purchase order types: purchase order, blanket purchase agreement, and contract purchase agreement.
References: Oracle Procurement Cloud Using Procurement (Release 9), page 131

Explanation
The new Manage Requisition Approval task provides a simple and user-friendly interface for approval rules management. This task allows you to:
* Enable or disable a participant.
* Create rules using simple or nested conditions. Condition attributes displayed in this interface are consistent with the attribute names displayed in the application. Attribute values can be chosen from a List of Values or a Choicelist, when applicable.
* Define rule actions that:
o Use Supervisory Hierarchy, Job Level, Position Hierarchy, Approval Group, Single User, or Custom routings.
o Require approvals, automatically approve, or send information notifications.
* Mark a rule active or inactive.
* Maintain user-defined attributes and use these attributes across rules.
o Currency based attributes are used to setup conversions of amount or price type attributes to a specific currency used in rule evaluations.
o Custom attributes are used to achieve complex approval requirements and custom approval lists and map to the Procurement Custom Function output.
o Summation attributes support the aggregation of data across lines or distributions based on a set of filters.
The filters can be set up using requisition attributes or based on roll-ups in the Procurement Category Hierarchy, Cost Center, Balancing Segment, Management Segment, or Natural Account hierarchies