The SAP DB2 database interface is using this value to
1. create the SAP default package set name SAP<CLI release><dbs/db2/applcompat>[U]
2. set the package set application compatibility at bind time via CLI API SQLCreatePkg
3. set the clientApplCompat via CLI API SQLSetConnectAttr
If the value is not set the SAP DB2 database interface is using SAP<CLI release>[U] as default package set name and does not use the APPLCOMPAT parameter in SQLCreatePkg and does not set clientApplCompat.
