Hi Gerardo:
I think it has to deal with SAP charging fees for each payroll result produced though the system and not actually with a country-specific solution consulting issue I see implied in previous answers.
SAP engines (also known as packages) are optional applications for which additional licenses must be purchased. The metric used for licensing is unique to each engine, and based upon the objects that exist within that application.
Many engines provide counting functions used by the SAP measurement program (USMM) to determine whether an engine is being used and how, and the results are included in the License Administration Workbench (LAW) report.
See more at: Lifting the Lid on SAP Engines
You should try to contact your SAP o partner business sales representative to enquiries for details as it is my understanding price structure is SAP customer specifics.
Let us know how it goes!
Best,
Antoine