Assign Payment Items to Collector/Queue 
You can use this function to assign payment items to a collector or a queue during the clearing and settlement process and to manage the clearing process, for example, to consolidate payment transactions for a given period into one payment unit.
Routing Control assigns payment items with references to a clearing agreement and a route. For example, if the clearing agreement is of type collector, the system searches for an open collector of the clearing agreement that has exactly the same (separation) attributes as defined in the payment items. If no collectors exist, the system opens a new collector.
Integration
The system assigns payment items to a collector category or a queue category based on the separation criteria defined in clearing agreements. If at least one of the attributes in a payment item does not match the criteria defined for the open categories, the system generates a new collector category or queue category with a new collector number. It then assigns the payment item to this category.
Each collector category and queue category is given a collector number based on a number range that you have defined in Customizing.
The system assigns the payment items to new or existing sequences depending on the closing criteria defined for the category in the clearing agreement. For more information, see Clearing Agreement.
Prerequisites
You have defined whether a collection of payment items is to join an existing collector or queue or whether a new collector or queue is to be generated for different conditions: On the SAP Easy Access screen, choose 
Payment Engine 
Master Data Routing Control Manage Routes and Clearing Agreements 
(transaction /PE1/RN).
For more information, see Setting Up Queues and Collectors.
You have mapped the error codes of the account management system to the error codes used in Payment Engine and specified the relevant error ID used in Exception Handling in Customizing for Payment Engine under Posting Interfaces DM Proxy [or] BCA Proxy Response .
You have defined a number range for numbering of collector and queue categories in Customizing for Payment Engine under Clearing Maintain Number Ranges for Collectors .
Features
If a category meets the closing criteria defined in the clearing agreement, but payment items that match the collection criteria still need to be assigned to the category, the system creates a new sequence. The system always selects the last sequence in a category and checks the corresponding closing conditions before assigning payment items. Each time payment items are assigned to a sequence, the system updates the total amount and the number of payment items.
The first open sequence in a category is given the sequential number 0001. If another payment item with the same parameter combination is collected, but the sequence is closed, for example, because it contains the maximum number of payment items defined in the clearing agreement, the system generates a new sequence that opens with the sequential number 0002.
The collector category number does not change until the payment transaction reconciliation date changes. A collector category cannot be finalized if it contains open sequences. Numbering of sequences restarts at 0001 for new open collector categories or queue categories (with a new collector number and a new reconciliation date).
You can remove payment items from queues and collectors in the following cases:
If technical problems occur with a route and a different route has to be used, you can delete payment items from a queue or collector.
You can remove payment items from a queue or an open clearing collector for recall processing.
For more information, see Recall Processing.
You can remove all payment items that are assigned to a queue or an open clearing collector from the given queue or clearing collector.
The system deletes the reference fields in all payment items and closes the queue or collector.
When you remove a payment item that is assigned to an open queue or an open clearing collector from the queue or collector, the system deletes the reference fields in the payment item (collector category number, sequence number, and payment transaction posting date) and updates the collector data, such as the number of payment items and the current total amount.
If you remove the last payment item from an open collector, the system closes the collector.
Note
You can remove internal payment items from open customer collectors only if the payment items have not been assigned to a sequence.
Activities
To assign payment items to a collector manually, on the SAP Easy Access screen, choose
Payment Engine Clearing Manage Collectors and Queues (transaction /PE1/CP_COLL).To assign payment items to a queue manually, on the SAP Easy Access screen, choose
Payment Engine Clearing Manage Collectors and Queues (transaction /PE1/CP_COLL).To assign payment items to a queue or collector automatically using a batch process, on the SAP Easy Access screen, choose
Payment Engine Periodic Processing Processes Execute Processes (transaction /PE1/POLLER).To remove payment items from a queue or collector, you must determine whether:
You want to assign payment items to a new route and a new clearing agreement manually.
You want Payment Engine to reprocess payment items again in Routing Control and Clearing Processing.
Payment items are to be posted in a prior period.