Steps
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Open Accounting → Setup and Posting rules.
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Create a new rule or choose Edit on the intended rule. Select the module and source type, then specify item type and cost centre when the mapping needs those restrictions.
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Select the debit and credit accounts, set priority and active state, and enter a description or finance note.
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Save the rule and check it in the rule list. Use the active-state control to disable an obsolete rule; review the resulting mappings before relying on later postings.