code: public FieldDefinition getInverseLinkDef() {
          assert isLinkType();
          TableDefinition inverseTableDef = getInverseTableDef();
          if (inverseTableDef == null) {
              return null;
          }
          return inverseTableDef.getFieldDef(m_linkInverse);
      }
docs: Get the {@link FieldDefinition} of this field's inverse link definition. This field
  must be a link field. Null is returned if either the inverse table or inverse link
  have not been defined in this application.
  
  @return  {@link FieldDefinition} of this link field's inverse link field or null if
  the inverse table or link have not been defined in this application.