Function module/Table to get Partner details from PO header tab

Hi,

      I need to check the PO Location and Ship-to-address value equals "Multiple" on PO Overiew tab/Header tab under Partner.

Have tried FM's like "BBP_PROCDOC_GETDETAIL_ARCHIVE" and "BBP_PD_PO_GETDETAIL", however it does get partner details but doesn't get t he text "Multiple".

PO Overbiew tab:

PO Hedaer tab:

Thank you.