💡 Invoice Posting in SAP MM: Yours, Mine or Ours?

contacts4hana
Jun 24
3 min read

You’ve just started learning SAP MM, and you come across the transaction MIRO.

Then you wonder:“Wait... isn’t this part of finance?”Or maybe your FI buddy says, “Hey, MM handles that!”

Let’s clear the confusion once and for all:

✅ Invoice posting is a shared responsibility between SAP MM and SAP FI.

It’s not "either-or". It’s “together we make it work.”

🔍 What’s Invoice Posting Anyway?

In real-world SAP projects, invoice posting is the process of recording a vendor’s invoice after goods/services are delivered.

It sits right in the heart of the P2P (Procure-to-Pay) cycle.

Here’s how it flows:

🛒 PO Created → 📦 Goods Received → 🧾 Invoice Posted → 💰 Payment Processed

But here’s the twist:While the invoice hits finance books, it starts its life in the logistics world.

🧠 Where MM Consultant Comes In

SAP MM is responsible for all things logistics:

✅ Creating purchase orders & GRNs
✅ Ensuring accurate pricing conditions
✅ Handling three-way match: PO 🟰 GR 🟰 Invoice
✅ Defining tolerance limits for price/qty mismatches
✅ Blocking faulty invoices until resolved

🎯 MM ensures the invoice is backed by a valid PO and goods receipt.

💼 Where FI Consultant Steps In

Once the invoice is validated by MM logic, Finance takes over:

💳 Posts vendor liabilities
🧾 Applies tax codes, WHT, and exchange rates
💼 Triggers payments & financial reporting
🏦 Updates ledgers through automatic account postings

🎯 FI ensures the money trail is clean, auditable, and compliant.

🔄 Where They Both Collide: MIRO

The MIRO transaction is where SAP magic happens — Logistics and Finance work hand-in-hand.

MM handles the logistics invoice verification (LIV) side
FI captures the financial posting to vendor and GL accounts
One wrong config on either side… 💥 and MIRO throws errors

🧩 MIRO = Masterpiece of SAP integration

💥 Real Project Scenario

Imagine this:

You’re in an implementation project.You finish your PO, GR is smooth, and now the user runs MIRO…

❌ Error: Account key not defined in OBYC

Who's responsible?

MM consultant checks valuation class & movement types
FI consultant configures OBYC settings

Moral of the story?Invoice posting doesn’t belong to a single module — it’s teamwork.

🤝 It’s Not MM vs FI. It’s MM + FI.

Invoice processing is a cross-functional powerhouse:

Task	MM Role	FI Role
PO creation	✅	❌
GR posting	✅	❌
Invoice validation	✅	✅
GL posting	❌	✅
Payment	❌	✅

🧠 To deliver end-to-end value, both consultants need to collaborate and co-own the process.

🧭 So, Is It in SAP MM Scope?

Yes — partially.Invoice posting begins with MM’s validation but ends in FI’s financial records.

You’ll configure it together, test it together, and troubleshoot it together.

🎯 Ready to Become the Go-To Consultant for MM-FI Integration?

✅ Stop just learning — start mastering.✅ Learn the MIRO process like real consultants do in projects.✅ Get hands-on with configuration, error handling, OBYC, GR/IR, LIV, and more.

🎓 Whether you're a fresher, a domain expert, or switching to SAP — our programs are designed to equip you for real-world consulting roles.

🔗 Start your journey todad

MM - https://sastrageek.com/mm

FICO - https://sastrageek.com/fico

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