var jvmMethod = element.toMethod("fromSap",element.newTypeRef(element.dtoFullName))[
						var jvmTypeReference= fromSap.sapType;
						
						var param = toParameter("sapOb",jvmTypeReference)
						parameters+=param
						body = ['''....''')]

public class DTOTest {
  public DTOTest fromSap(final String sapOb) {
    DTOTest result = new DTOTest();
    return result;
    
  }
}

	param.setFinal(false);

This expression is not allowed in this context, since it doesn't cause any side effects.