Which document type is typically associated with replenishing PB stock from external sources?

The document type associated with replenishing PB stock from external sources is the YPB, or Yearly Provisioning Batch. This document plays a crucial role in inventory management within the Army's supply chain system, particularly in managing and replenishing pre-positioned stock.

The YPB is utilized to assess inventory levels and facilitate the procurement of necessary items to maintain adequate stock levels. It allows for effective planning and coordination with external suppliers to ensure that resources are available when needed, thus enhancing operational readiness. The use of YPB helps streamline the replenishment process, ensuring that supplies are sourced efficiently and effectively.

In contrast, the other document types listed serve different purposes within supply chain management. For instance, a PR (Purchase Request) is typically used to initiate a request for purchase but does not specifically relate to replenishing a PB stock from external sources. An MR (Movement Request) pertains to transferring materials within the supply chain rather than replenishing stock. A GR (Goods Receipt) is primarily utilized to confirm receipt of goods rather than for initiating replenishment from external sources. Each document has its own specific function within the overall supply process, making the YPB the most appropriate choice for replenishing PB stock.