Decision table only supports "." as decimal seperator

In the german locale "," is used as decimal seperator.
When using a "," in a localized spreadsheet drools does not parse this as a number but tries to read two arguments instead.

Attached sheet has the following Rule Compilation error:
The method set(String, Object) in the type RegelErgebnis is not applicable for the arguments (String, int, int)

This error comes from coulumn G of the spreadsheet when trying to execute action: ergebnis.set(String, Object);
This fails as $param is read as two int values instead of an Object.