Hi Daniel
If we use two input fields and use them for LOW and HIGH values then we need manually do certain standard validations like if the low values is less then the HIGH value or not.
Instead you can create SELECT-OPTIONS in webdynpro.
You can refer to the following link for detailed explanation about how to implement
There several options in select options like obligatory, no extension, no intervals etc.
These options can be found in following link
Hope this is helpful
Points please if helpful
Regards
Subhash