Comprehensive and Detailed In-Depth Explanation:
Opportunistic cross-docking in SAP EWM allows goods to be moved directly from goods receipt to goods issue without intermediate storage, optimizing warehouse efficiency. This functionality is enabled at the product level and linked to the warehouse process type, which defines the process flow (e.g., putaway, picking, or cross-docking). In a decentralized EWM system, the configuration is maintained in the product master data (under the "Warehouse" tab) where you specify cross-docking relevance, and in the warehouse process type (SPRO: SCM Extended Warehouse Management > Cross-Docking > Opportunistic Cross-Docking) where the system determines whether a product can bypass putaway. The warehouse process type controls the movement type, and the product master defines eligibility, making option B the correct choice. Options A, C, and D are incorrect because the document type and warehouse alone do not control this process-it's a combination of product-specific settings and process type logic.