SAP ERP with MS SQL Enterprise

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http://serverfault.com – My company has introduced a new SAP ERP suite which includes SQL Enterprise edition. SAP ERP will be running on 5 physical servers with MS Windows Server. Here is my Q. How many physical servers can I install MS SQL Server? There is no clue in the contract about the quantity of SQL Server- only the price. Would I be able to install the SQL Server Enterprise edition on all 5 physical servers under the contract? or Should I just install it on 1 physical server? does anyone know? (HowTos)