During installation of SAP Business One, the required Database Server Type may not available as below.
SQL Driver Installation
Open the SQL Server Installer, locate below subfolder and highlighted files.
..1033_ENU_LP\x64\Setup\x64
msodbcsql - Required for DRIVER 13 FOR MICROSOFT SQL SERVER 2017
sqlncli - Required MSSQL 2012 NATIVE CLIENT
Copy both files to the SAP Server/PC and install it.
How to inspect the Driver is available?
Open ODBC Windows. (Search 'ODBC' from the Start Menu if you are not sure)
ODBC Driver 13 and SQL Native Client 11.0 should available in ODBC Driver tab in both 32bits and 64bits ODBC Data Source Administrator.