AshishSeveral colleagues have asked me questions about the integration between Materials Management (MM) and Financial Accounting (FI) modules:

- How do postings flow from MM into FI?

- How do we find out what occurs behind-the-scenes?

- How do we identify which movement types are pointing to a specific GL Account?

- How do you change the posting to a different General Ledger (GL) Account?

- How do you create a new movement type and assign it to a specific GL Account?

Many SAP practitioners – IT and business alike – are in a similar situation and do not know where to start MM-FI data flow and reconciliation. This blog clarifies the fundamentals of MM-FI account determination.

Configuration transaction OBYC forms the core of SAP’s integration between the MM, FI, and Controlling (CO) modules in a traditional SAP ERP system

Transaction keys (1)  are used to determine general ledger accounts used by the system. Account modifier is used to differentiate account determinations, depending on the procedure. [Transaction and account modifiers can be seen as a logical grouping similar types of transactions]. The transaction-account modifier, along with the valuation class, drives the accounting entries. Transaction keys are predefined in the SAP system and cannot be changed.


















Figure 1: OBYC setup for BSX – Inventory posting

Many of you may have seen an accounting entry at the time of the purchase of raw material as a debit to inventory and credit GR/IR. The configuration setup of transaction BSX (inventory posting) is responsible for the inventory posting (see Figure 1), and WRX (GR/IR clearing account) is responsible for GR/IR posting. When movement type 101 is used to record the goods receipt of raw material (valuation class 3000) for a purchase order, the system looks up the GL Account for transaction BSX and WRX for valuation class 3000 and records it in the accounting document.
















 Figure 2: OBYC setup for GBB-VBR – Consumption to Order

Similarly, when raw material is consumed using movement type 261, the system looks up transaction GBB (offsetting entry for inventory posting) for account modifier VBR (consumption for internal goods issues), and that reflects the GL Account in the accounting document (see Figure 2)

Figure 3 provides a summary of few important movement types and accounting entries. Business process is listed in the column furthest to the left, with movement type in the next column, and the debit and credit posting in the subsequent columns.

There is a column for transaction and account modifiers; as we noted earlier, these are SAP’s terms for logically grouping similar types of transactions. The transaction account modifier, along with the valuation class, drives the accounting entries.

The OBYC MM-FI account determination configuration is set up at the time of original implementation, and once set up, these accounts are derived behind the scenes. You’ll want to test the setup before going live to ensure that the correct accounts are being hit for the respective transactions. You can change this configuration after go-live, but the revised setup needs to be thoroughly tested. Otherwise, we may run the risk of impacting regular operations.

Figure 3: Summary of select movement types and accounting entries

Key take-aways:

I hope this write-up was useful and explained the fundamentals to the readers.

(1) - The transaction key in MM-FI account determination is not the same as transaction code. A transaction code is an alphanumeric code that represents a particular task in SAP. It allows users to access tasks directly without having to use menu paths.

About the Author
Ashish Sampat is an SAP FI/CO Consultant who has provided solutions in SAP Controlling including product costing, SAP Material Ledger, and cost center accounting to global clients in consumer packed goods, life sciences, and industrial sectors.  Ashish is based in the Chicago region, where he works as an independent SAP FI/CO consultant. Ashish is the author of best selling SAP books including: First Steps in SAP Controlling (CO) and Expert tips to Unleash the Full Potential of SAP Controlling.