Implementation for CRM_MKTPL_OL_OBJ not trigerring

Hi,

    I have Created an Implementation for the BAdi CRM_MKTPL_OL_OBJ with Filter Value 'TPM' . I have Implemented the Method 'CHECK_ATTRIBUTES' to check the Data on the Trade Promotion Header and raise Error Messages for some Missing Data. But my Custom Implementation is not trigerring and only the Standard Implementation for this BAdi  (CRM_MKTPL_OL_OBJ_TPM) with the Same Filter Value 'TPM' is trigerring. Can someone let me know if there is something I am missing.

Thanks and Regards,

H.Krishnan