MB-330 Implement Master Planning Practice Question
A company uses Master Planning with a plan that has 'Firming' enabled. The planner wants to automatically firm planned purchase orders that are within a 10-day time fence from today. The plan is set up with a firming time fence of 10 days. After a master plan run, the planner notices that some planned purchase orders within the 10-day window were not automatically firmed. What is the most likely cause?
⚠ Common exam trap
The trap here is assuming that any planned order created within the time fence will be automatically firmed, when in fact the firming is based on the requirement date, which may differ from the order date.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The firming time fence is applied based on the requirement date, and the planned orders have a requirement date beyond the 10-day window.
Automatic firming of planned orders within the firming time fence depends on the requirement date of each order. If a planned purchase order has a requirement date that falls outside the 10-day window from today, it will not be firmed automatically. The planner must check the requirement dates, not just the order creation date, to understand why some orders were not firmed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The firming time fence is set on the master plan, but the item's coverage group has a different firming time fence that overrides it.
Why it's wrong here
Firming time fence is defined on the master plan, not on the coverage group. Coverage groups do not have a firming time fence setting. Therefore, this cannot be the cause. The planner should check the master plan's firming setup and whether the planned orders fall within the time fence.
- ✓
The firming time fence is applied based on the requirement date, and the planned orders have a requirement date beyond the 10-day window.
Why this is correct
Automatic firming within the firming time fence is based on the planned order's requirement date. If the requirement date is beyond the 10-day window from today, the order will not be automatically firmed, even if it appears within the window based on other dates. The planner should verify the requirement dates of the unfirmed orders.
- ✗
The planned purchase orders are for items with a default order type of 'Production' and are therefore not firmed as purchase orders.
Why it's wrong here
The default order type determines the type of planned order generated. If the item's default order type is 'Production', the plan would generate planned production orders, not purchase orders. The planner observed planned purchase orders, so the default order type is likely 'Purchase'. This option is not the cause.
- ✗
The planned orders have a status of 'Approved' and are therefore not eligible for automatic firming.
Why it's wrong here
Planned orders with a status of 'Approved' are already firmed or in the process of being firmed. Automatic firming applies to planned orders with a status of 'Planned'. If an order is already 'Approved', it has likely been firmed manually or by another process. The issue is more likely related to the firming time fence or order type settings.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Microsoft exam blueprint
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