Payment Matching Prerequisites 
The Financial Accounting and Funds Management data can only match on payment matching if the following conditions are fulfilled. Otherwise, variances will occur which the programs will display accordingly.
Customizing settings
Enter other settings.

Discount: If the Value Added Tax is gross, then you must choose Backdated tax calculation when executing the program SAPF181, which distributes the cash discount expenses when paying an invoice. If you have chosen "separate", you may not set this indicator.
For more information about program SAPF181, refer to the program documentation and
Assigning G/L account commitment item with correct
Financial TransactionG/L account |
Commitment with financial transaction |
Bank and check clearing accounts |
80 |
Clearing accounts for cross- company code and so cross-FM area transactions |
80 |
In the reconciliation account for the down-payment settlement |
30 |
Bank accounts |
90 |

All postings that lead to a change in monetary holdings must be transferred into Funds Management. If these postings are not budget-relevant they still must be updated statistically. To statistically update postings you can use the
User exit SAPLFMFA (enhancement SAPLFMFA, component EXIT_SAPLFMFA_001, development class FMFS, transaction CMOD). See Statistical Postings.If you use the financial transaction 50, you should check if commitment items with the financial transaction are addressed for postings leading to a change in monetary holdings.
Integration of FM with Other Components in the R/3 System
It must be defined in the Funds Management Customizing, in the step
Make other settings that the redemption of the purchase order commitments takes place at the time of the invoice receipt.A redemption of the purchase order commitment at the time of the goods receipt
Depending on whether the trip costs advances are budget-relevant or not, you have to choose the following settings:
In the account "Trips cost advance" a commitment item with financial transaction 60 has to be defined.
In the account "Trips cost advance" a commitment item with financial transaction 30 has to be defined. In the clearing account for the employee a commitment item with financial transaction 80 has to be defined.
In the accounts relevant to payroll accounting commitment items must be defined with financial transaction 30. In the clearing accounts for the employee a commitment item with financial transaction 80 has to be defined.
User Activities
You may not carry out the following postings in Financial Accounting:
The reversal of documents with commitment items with the financial transaction 90 and 30 must always take place with the posting date of the original FI document.
Preparing the Payment Matching
If you do not activate the payment matching immediately on production startup but want to activate it later, then different scenarios are feasible, which also require a different procedure. For more information, read
Correct data for Payment Matching.