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SAP MRP Types, Lot Sizing and Procurement Keys Reference

The MRP type, lot sizing key and procurement type in the material master MRP views decide how SAP plans every material. A wrong setting means too many orders, no orders, or the wrong kind of order. This reference lists the common standard keys.

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Field	Key	Meaning	Planning note
MRP type	PD	MRP	Deterministic planning on requirements, the standard for planned parts
MRP type	ND	No planning	Material is excluded from MRP, useful for non planned consumables
MRP type	VB	Manual reorder point planning	Planning when stock falls under the reorder point, quantity entered by the planner
MRP type	VM	Automatic reorder point planning	Reorder point and safety stock computed from forecast values
MRP type	V1	Manual reorder point planning with external requirements	Reorder point planning that also looks at dependent and sales demand
MRP type	V2	Automatic reorder point planning with external requirements	Automatic reorder point plus external requirements
MRP type	VV	Forecast based planning	Requirements derived from the forecast, no reorder point
MRP type	M0	Master production scheduling	Planning of master schedule items before the rest of the BOM
Lot size	EX	Lot for lot order quantity	One order per requirement, no stock built
Lot size	FX	Fixed lot size	Order quantity fixed in the fixed lot size field, repeated until the shortage is covered
Lot size	HB	Replenish to maximum stock level	Order up to the maximum stock level, common for reorder point materials
Lot size	TB	Daily lot size	Requirements of a day grouped into one lot
Lot size	WB	Weekly lot size	Requirements of a week grouped into one lot
Lot size	MB	Monthly lot size	Requirements of a month grouped into one lot
Procurement type	E	In-house production	Planning creates planned orders
Procurement type	F	External procurement	Planning creates purchase requisitions
Procurement type	X	Both procurement types	Either, decided by special procurement or the planner
Special procurement	10	Consignment	Vendor owned stock at your site
Special procurement	20	Stock transfer	Obtain the material from another plant by stock transport order
Special procurement	30	Subcontracting	Material is made at a vendor using components you provide
Special procurement	40	Production in another plant	The planned order is produced in a different plant
Special procurement	50	Phantom assembly	Assembly is not stocked, its components go straight to the parent order

MRP types, lot sizes and special procurement keys are configured per customer and can be extended. The entries above are SAP standard keys, confirm them in your own customizing (OMI8 and OMI4 for MRP types and lot sizes) before changing material masters.

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How to use this reference

Filter by field to see only MRP types, lot sizes, procurement types or special procurement keys. Search for a word such as reorder or consignment to find the right key. Use the planning note to choose a setting when you build material master templates, or to check an existing material against what the planner expects. Export to Excel for training notes and data migration mapping.

How these settings work together

The MRP type chooses the planning method: deterministic MRP (PD) works from requirements, reorder point planning (VB, VM) reacts to stock level, and forecast based planning (VV) follows the forecast. The lot sizing key decides order quantity once a shortage is found. The procurement type decides whether planning creates a planned order or a purchase requisition, and special procurement overrides it for cases like subcontracting or stock transfer. The MRP controller and planning time fence then decide who sees the result and what can change.

PD plus EX suits made to order parts with known demand
VB or VM with HB suits cheap consumables and bulk items
ND suits items that you do not want in the planning run
Special procurement 30 requires a subcontracting info record and a BOM

Worked example

A plant buys M6 bolts that are used everywhere and cost cents. Planning them through PD creates thousands of requisitions. Setting MRP type VM with reorder point and safety stock, lot size HB with a maximum stock level, and procurement type F means the system raises one requisition per replenishment cycle. A high value machined housing, in contrast, stays on PD with EX so that every order ties to a real need.

Common mistakes

Setting a reorder point on a PD material does nothing for MRP except safety stock logic. Leaving the lot size on EX for low cost items floods buyers with small requisitions. Switching MRP type on a live material without resetting the MRP area, planning file entry or forecast can lead to missing orders until the next net change run. And changing a special procurement key on materials that have open orders requires a review of those orders first.

Frequently Asked Questions

What is the difference between MRP type PD and VB?

PD is deterministic MRP: it plans from actual and forecast requirements, creating orders for each shortage. VB is manual reorder point planning: it orders when available stock drops below the reorder point, ignoring future requirements. VB is simpler and suits low value or stable consumption items.

Where do I set the MRP type in SAP?

In the material master, on the MRP 1 view, via MM01 for creation or MM02 for changes. The MRP type, MRP controller, lot sizing procedure and reorder point sit on that view. Procurement type and special procurement are on the MRP 2 view. Use mass change tools for large volumes.

What does lot size EX mean in SAP?

EX is lot for lot order quantity. For each shortage MRP creates an order of exactly the missing quantity, with no extra stock. It is common for expensive or made to order items. Rounding values, minimum lot and maximum lot can still change the proposed quantity.

How do I exclude a material from MRP?

Set the MRP type to ND, no planning, in the MRP 1 view. The material is then ignored by planning runs, but stock and movements still work. Make sure open demand does not exist first, because ND will not create orders for it.

If your planners spend time explaining why MRP created or missed an order, we can build a read-only assistant that explains the planning result from your material master and stock data.

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