rsdb/vmcj/codepage_compatibility is a SAP Parameter attribute which is used to control Grad der von Open SQL fuer JTS unterstuetzten Codepage Konvertierungen information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter defines the supported conversions for "Open SQL for Java"
when reading or writing character-type data. Set the parameter in
accordance with the system code pages used in the system landscape. The
following values are possible:
0 ==>
Set this value in a purely Unicode system landscape. There are no
restrictions when reading or writing data using Open SQL for Java.
1 ==>
All non-Unicode systems in a system landscape have the same system code
page. In this case, Open SQL for Java ensures that only characters from
this code page can be written.
2 ==>
The system landscape contains non-Unicode systems with different system
code pages. In this case, only 7-bit ASCII characters can be written
using Open SQL for Java, since it is only possible to guarantee a
loss-free reconversion to Java (UTF16 Unicode) for these characters.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.