This is a collective search opening due to which there are multiple options (Search Help) in further search help drop down.
As per my analysis (might be differ as per your SRM Version)
BBP_BUPA_CLL_PARTNER is the collective search help which is opening, which includes another collective search help BBP_BUPA_SOURCE_OF_SUPPLY, in turn which includes below mentioned elementary search helps.
Hierarchical Search Help by Supplier - BBPH_BUHI_VENDOR
Supplier - BBP_BUPA_VENDOR
You can check the above mentioned details in SE11.
Please note: Default elementary search help of collective search help is maintained in standard table DDSHDEFSH. Table DDSHDEFSH just saves the last search help you used of a collective search help i.e. the Further Search help drop down shows the last selected(searched) elementary search help which is saved in DDSHDEFSH.
Let me know in case you need more information regarding to this.