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.

Comprehensive and Detailed In-Depth Explanation:
The early capacity check in SAP EWM ensures bins can accommodate stock before task execution. Option C ("It happens during the warehouse task creation") is correct as it occurs when tasks are generated, and option D ("It is based on capacities of bin types") is correct because it uses bin type capacity data, both configured in SPRO: SCM Extended Warehouse Management > Goods Receipt Process > Capacity Check. Option A (mobile devices) is incorrect as it's not device-specific, and option B (during putaway) is too late for an "early" check.

Comprehensive and Detailed In-Depth Explanation:
External process steps in SAP EWM's process-oriented storage control (POSC) are assigned to objects defining the process flow. Option B ("Warehouse process type") is correct as it links external steps (e.g., VAS) to the process, and option D ("Work center") is correct because it's where external steps are executed, both configured in SPRO: SCM Extended Warehouse Management > Cross-Process Settings > Process- Oriented Storage Control. Options A and C are not standard assignment objects for external steps.

Comprehensive and Detailed In-Depth Explanation:
In process-oriented storage control (POSC) for putaway, warehouse tasks are created for specific steps.
Option D ("The first and final process steps") is correct because tasks are generated for the initial step (e.g., unloading) and the final step (e.g., putaway to bin), as defined in the storage process configuration in SPRO:
SCM Extended Warehouse Management > Cross-Process Settings > Process-Oriented Storage Control.
Option A (all steps) includes intermediate steps not always task-based, while B and C are too restrictive.