sap-mm

name	sap-mm
description	This skill handles SAP MM (Materials Management) including purchase requisitions, purchase orders, goods receipts, invoice verification, inventory management, GR/IR clearing, material master, vendor evaluation, and period-end closing. Use when user mentions MM, purchasing, procurement, MIGO, MIRO, ME21N, ME23N, MB52, MR11, GR/IR, material master, inventory, stock, MRP, info record, outline agreement, MMPV, account determination, OBYC, movement type, physical inventory, batch management, valuation class.
allowed-tools	Read, Grep

1. Procurement Cycle

PR (ME51N) → RFQ (ME41) → Quotation (ME47) → PO (ME21N)
→ GR (MIGO 101) → IV (MIRO) → Payment (F110)

Shortcut flows:

• Without RFQ: PR → PO (ME58 — auto-convert PR to PO)
• Consignment: PO item cat K → GR → settlement (MRKO)
• Subcontracting: PO item cat L → GI components → GR finished

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2. Purchase Order Issues

Account assignment errors

• Category K (cost center): cost center must exist and be active
• Category A (asset): asset master must exist, depreciation area active
• Category F (internal order): order must be in Released status
• Category P (project/WBS): WBS element must be open for costs

Tolerance check (MIRO)

• OMR6 → tolerance keys: BD (amount) / VP (moving avg price variance) / PP (price)
• Tolerance = percentage + absolute amount — both must be within limits

GR-based invoice verification

• PO item → Invoice tab → GR-Based IV flag = X
• With flag: MIRO only possible after GR; invoice quantity = GR quantity

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3. Goods Receipt (MIGO)

Key Movement Types

MVT	Description	Notes
101	GR for purchase order	Standard GR
102	Return to vendor (reversal of 101)	Requires original GR doc
122	Return delivery to vendor	With return PO
161	GR for return PO	For returns with credit
201	GI to cost center	Free goods issue
261	GI for production order	Component consumption
301	Transfer plant to plant (1 step)	Same company code
311	Transfer storage location to storage location	Same plant
551	Scrapping	Write-off to loss account

Account Determination (OBYC)

• Transaction key BSX: inventory posting (stock G/L account)
• Transaction key WRX: GR/IR clearing account
• Transaction key PRD: price difference account (standard price)
• Transaction key GBB: goods issue / offsetting accounts
• Valuation class (material master → Accounting 1) links material to G/L accounts

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4. Invoice Verification (MIRO)

Blocking reasons

Code	Reason	Release T-code
R	Manual block	MR02 / MRBR
A	Amount exceeds tolerance	MRBR (automatic)
D	Date issue	MRBR
Q	Quantity variance	MRBR
P	Price variance	MRBR

Parked invoices: MIR7 (park) → MIRA (mass release) / MIR4 (display)

Credit memos: MIRO → transaction = Credit Memo → reverses original invoice logic

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5. Inventory Management

Physical inventory process

1. MI01: create physical inventory document → print count sheet
2. MI04: enter count results (or MI09 if system count differs)
3. MI07: post inventory differences → generates MM document + FI document
4. MI20: list of inventory differences for review

Key reports

T-code	Report
MMBE	Stock overview (all stock types)
MB52	Warehouse stocks of material
MB53	Plant stock availability
MB5B	Stocks for posting date
MB51	Material document list

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6. Material Master Key Views

View	Key Fields
MRP 1	MRP type, MRP controller, lot size procedure
MRP 2	Planned delivery time, safety stock
MRP 3	Strategy group (make-to-stock vs make-to-order)
MRP 4	BOM explosion, individual/collective requirements
Accounting 1	Valuation class, price control (S/V), standard/moving avg price
Purchasing	Purchasing group, info update, GR processing time
Plant Data/Stor.1	Storage conditions, shelf life, batch management

Extend to new plant: MM01 → select org levels → plant / storage location

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7. MM Period Close

• MMPV: close MM posting period — must precede FI period close (OB52)
• MMRV: allow posting to previous MM period (emergency use only — document reason)
• Check open GR/IR before closing: MB5S → identify items needing MR11

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8. S/4HANA MM Differences

Topic	ECC	S/4HANA
Material document tables	MKPF / MSEG	MATDOC
CDS access	SELECT MKPF/MSEG	I_MaterialDocumentItem
Stock in transit	Not available	New concept for plant-to-plant
Inbound delivery	Optional	Mandatory for some scenarios
MRP run	MD01	MD01N (MRP Live — HANA optimized)
Purchase order history	EKBE	I_PurchaseOrderHistory (CDS)