Queue 
A collection of individual payment items that are parked for manual release or automatic release at a scheduled processing time, for example, during end-of-day processing.
You use queues for the following reasons:
You want to check payment items individually or manually by group (for example, to perform a liquidity check) before posting and sending them for output processing.
You want to release payment items manually to supervise the release.
You want to schedule processing of payment items at a defined time and not immediately.
Note
You define whether payment items are collected in queues in clearing agreements. For more information, see Setting Up Queues and Collectors.
Payment items parked in queues are sent individually in an outgoing payment order or a posting item for further processing.
In queues with external payment items, one clearing item is created for each payment item and no collective posting takes place.
You can assign similar payment items to the same queue, for example, payment items with the same value date or processing date or payment items of the same type. For more information, see Assign Payment Items to Collector/Queue.
When the processing date and time are reached for a payment item, the payment items are removed from the queue for processing and posting.
Payment Engine uses the following types of queues:
Functional queue
The system sends payment items to a functional queue based on the settings in the clearing agreement. These payment items remain in this queue until a predefined time has been reached to trigger further actions, such as reassignment of payment items.
Based on the setting in the clearing agreement, a reservation request can be sent when payment items are assigned to a functional queue.
When payment items are removed from a queue, the payment items are posted individually by using the original clearing agreement or by using an alternative clearing agreement based on the setting in the clearing agreement.
Technical queue
The system sends payment items to a technical queue if the setting in the clearing agreement locks forwarding of payment items via the defined route. These payment items remain in this queue until the lock has been disabled or until the payment items are manually released or rerouted to a different clearing agreement.
When payment items are assigned to a technical queue, a reservation request is always sent.
When payment items are removed from a queue, the payment items are posted individually by using the original clearing agreement or by using an alternative clearing agreement based on the setting in the clearing agreement.
Structure
Queue Screen
The queue screen contains the following screen areas:
Search area
You can enter a text to search for clearing agreements currently loaded in the navigation tree.
Navigation tree
Displays collection types, combinations of routes and clearing agreements, collection categories, and existing queues for the selected clearing area in a hierarchical structure.
Business object
Depending on the node that you select from the navigation tree, displays details about:
Collection type
Displays a list of existing queues in SAP List Viewer.
Combination of route and clearing agreement
Displays the collection information defined in the clearing agreement for a combination of route and clearing agreement. For more information, see Clearing Agreement under Collector Processing (Collector Only).
Collection category
Displays the characteristics that define the queue category.
Queue
Displays details about the selected processing sequence created for a queue category.
Queue Details
On the queue screen, you can find the following business object information:
Header Data
Collection type (queue or collector)
Collector processing date
Specifies the date on which the queue was used for processing.
Collector number
Determined by a number range that you define in Customizing for Payment Engine under
Clearing 
Maintain Number Ranges for Collectors 
.Sequence
Specifies a processing sequence within a queue category.
Direction
Displays whether the queue is intended for processing internal or external payments.
Basic Data
Status information
Displays the status of the queue. Only the statuses Open and Closed are relevant for queues.
Closing information
Displays the reason for closing a queue.
If a queue is open and is scheduled to close according to time-based criteria, this area also displays the time at which the queue status was last checked.
If a queue is closed, this area also displays the user who closed the queue and the time at which the queue closed.
Check of required clearing times
Current attributes
Displays the total debit amount and the total credit amount for the payment items in the queue in the collector currency. Also displays the number of payment items in the queue for a debit or a credit and the minimum number of payment items required to close the queue.
General attributes
Displays the following attributes:
Transaction currency
Value date
In the clearing agreement, you specify whether payment items with different value dates can be assigned to the same queue or collector.
Payment item limit (only relevant for collectors)
Multi collection (only relevant for collectors)
Payment item category
Debit or credit transaction
In the clearing agreement, you specify whether payment items for debit and credit can be assigned to the same queue or collector.
Minimum amount that a queue or collector must contain before closing
Clearing item posted (only relevant for collectors)
Clearing account
Displays the account details of the recipient or of a clearing account.
Administration Data
This tab page displays the user who created or last changed the queue and the time and date when the queue was created and last changed.
Integration
The Poller report picks up payment items parked in a queue for processing once their scheduled processing time and date has been reached.
You can access the Poller report on the SAP Easy Access screen by choosing Payment Engine Periodic Processing Processes Execute Processes
(transaction /PE1/POLLER).