At owl, can I preview the form of customBO?

Hi experts,

     Follow the step:http://help.sap.com/saphelpiis_studio_1511/KTP/Products/bf889ebdf45d4dd19d4a0e0bd39a07fb/LibraryStructure/SAP_BBD_Studio…

     I can preview the form of customBO, using OIF and QA.

    But when I change the OWL, add a button "preview", it is not OK.

     Can not load the GroupCode,what's the problem?

    Thanks.