You require stock material to carry out maintenance tasks. Which of the following statements regarding material planning

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You require stock material to carry out maintenance tasks.
Which of the following statements regarding material planning in the maintenance order are correct? (Choose three.)

A. Material can be assigned at order operation level.
B. Material can be assigned at order header level.
C. A control key for internal workforce is required when assigning stock material to an order operation.
D. The pick list for materials can be printed before order release.
E. A goods receipt can be entered for a technically completed maintenance order.