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Checking Due Dates 
When executing a settlement run, you must first determine which accounts are due.
If you run settlement in a mass run, the system searches for all due accounts using the selection parameters Execution Date and Bank Posting Area, which you entered in the transaction F991 Execute Account and Master Contract Settlement for the mass run.
If the Next Execution Date (settm_date) of an account is on or before the Execution Date specified for the mass run, then the account is due and is selected for the settlement.
If you execute settlement in a single run, then the account is settled on the settlement date that you specified. You can also settle an account in a single run outside of its regular time period. The system checks the due date of an account using the time period of the account.
You cannot settle an account after its due date. The settlement period cannot be extended.
You execute settlement in a single run or mass run from the SAP Easy Access screen under Account Management ® Account ® Account Settlement ® Execute Account Settlement or Account Management ® Periodic Tasks ® Settlement (Account/Master Contract) ® Execute Account and Master Contract Settlement.
Executing Account Settlement (Individual Processing)
Executing Account and Master Contract Settlement (Mass Processing)