[GSS](7.3.z) Build error with executable-model, nested property with double-bytes property name

Build of Executable Model fails with the following conditions in LHS:

• multi-bytes property name (or started with capital letter)
• accessing the property by the name without using getter.
• accessing nested property by `.`

e.g.

when
    $fact : Fact( 住所.zipCode == "1000001")
 ...