When inner class is used as Fact for guided rule it generates incorrect .brl file with error "BuildError: Unable to resolve ObjectType '<class>$<innerclass>'"

.brl source looks something like this:
<rule>
<name>guided</name>
<modelVersion>1.0</modelVersion>
<attributes/>
<metadataList/>
<lhs>
<fact>
<factType><class>$<innerclass></factType>
</fact>
</lhs>
<rhs/>
</rule>

When .brl file is modified and '$" is replaced with '.' i.e "<factType><class>$<innerclass></factType>" is replaced with "<factType><class>.<innerclass></factType>" error is fixed. .brl file is displayed without errors.

Steps to reproduce:
1. create new Drools Project
2. create new guided rule
3. add "import com.sample.DroolsTest.Message;" line to drools.package file
4. open new guided rule file add new when condition and select "DroolsTest$Message" as Fact type
5. save guided rule file and error will appear in Problems view