problem with HRHAP00_TEXT_SUBST badi ( text replacement badi in MBO )

Hi experts,

i have implemented the badi <b>HRHAP00_TEXT_SUBST</b> and its in active state but its not getting triggered when i click on the text replacement icon in <b>phap_catalog_pa</b> transaction, when i deactivate my zbadi and activate the standard implementation <b>HRHAP00_TEXT_SUBST01</b>, this is getting triggered, i am not understanding where am i going wrong, i have implemented four other badi's in the similar fashion all are working fine.

plz help.

Regards,

Santosh.