A queue is a logical file to which warehouse tasks (WTs) for processing are assigned. Queues define movements by which work in the warehouse is managed and assigned.
The management and distribution of work in the warehouse is accomplished by the assignment of resources and WOs to queues.
A resource may execute only those WOs that belong to one of its allowed queues (unless the WOs are manually assigned). This means a queue to which the resource or resource group is assigned, and in which the resource is authorized to work. In addition, a resource working within a particular operating environment may execute only those WOs that belong to a queue in the same operating environment.
You determine the operating environment of a queue during queue definition (Customizing for Extended Warehouse Management ® Cross-Process Settings ® Resource Management ® Define Queues).
The operating environment of a resource is determined when the resource logs on to the RF or non-RF environment.
You can assign a resource to a specific queue, or assign its resource group to a sequence of allowed queues. WO selection will be performed first according to the resource’s assigned queue, and, in the absence of an assigned queue, according to the resource group’s queue sequence. For more information, see Warehouse Order Selection.
You assign a resource to a queue using the resource maintenance transaction, accessed on the SAP Easy Access screen (Extended Warehouse Management ® Master Data ® Resource Management ® /SCWM/RSRC - Maintain Resource), or from the warehouse management monitor (Maint. Resource method).
You assign/unassign a resource group to/from a queue using the queue sequence for resource group transaction, accessed on the SAP Easy Access screen (Extended Warehouse Management ® Master Data ® Resource Management ® /SCWM/QSEQ - Maintain Queue Sequence for Resource Group), or from the warehouse management monitor (Assign Queue/Unassign Queuemethods)
When the system creates a WT, it searches for an appropriate queue to assign to it, based on the following WT parameters:
● Source activity area
● Destination activity area
● Warehouse process type
The search is performed in accordance with the access sequence, with the initial search being for an entry with all of these parameter values. If no queue is found, the queue determination table is read again, according to the next entry in the sequence.
You define queue determination criteria and access sequences in Customizing for Extended Warehouse Management ® Cross-Process Settings ® Resource Management ® Define Queues.