code: public void copyToMasterPrimaryKey(Storable reference, S master) throws FetchException {
          try {
              mCopyToMasterPkMethod.invoke(reference, master);
          } catch (Exception e) {
              ThrowUnchecked.fireFirstDeclaredCause(e, FetchException.class);
          }
      }
docs: Sets all the primary key properties of the given master, using the
  applicable properties of the given reference.
  
  @param reference source of property values
  @param master master whose primary key properties will be set