In SAP, the default decimal format is set when creating users with transactions SU01 and SU10 (this parameter is not used when creating users with function module BAPI_USER_CREATE).
Value Format initial 1.234.567,89 X 1,234,567.89 Y 1_234_567,89
You can display the the decimal notation parameter in zcsa/moddcpfm via transaction code RZ10.
