What is a monitoring Tool that provides the planner pointed information and access to problem situations in production planning in ePP/DS?

What is a solution that enables a collaborative problem-solving process together with suppliers?

In ePP/DS the Material Requirements Planning and Detailed Scheduling is performed by:

Which are prerequisites for scope item Production Subcontracting - External Processing (BJK)?Note:
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Which business role uses the Manage Production Orders app to release production orders in the SAP Best Practices scenario, Make-to-Order Production - Finished Goods Sales and Final Assembly (BJE)?