docs: public BaseField getFieldTarget()
      {
          BaseField fldTarget = m_fldTarget;
          if (fldTarget == null)
              if (targetFieldName != null)
                  fldTarget = (NumberField)(this.getOwner().getRecord().getField(targetFieldName));
          if (fldTarget == null)
              fldTarget = this.getOwner();
          return fldTarget;
      }