Cost Accounting 
In addition to their regular bookkeeping, many businesses perform expense and revenue analyses that measure the profitability of each of their business activities or departments.
The cost accounting function in SAP Business One enables you to define sets of cost centers and distribution rules. Generating respective reports provides important cost-related information.
SAP Business One provides two cost accounting methods: distribution rules and projects.
Note
You can set cost accounting-relevant configurations on the Cost Accounting tab of the General Settings window under 
Administration 
System Initialization
General Settings 
.
End of the note.