Storage location is being defaulted in shopping cart

There are some concerns related to the storage location being defaulted in shopping cart.
In PPOMA_BBP, storage locations are defined under “Extended attributes” tab, but no default flag is set.
Then, when end user creates a shopping cart, storage location is being defaulted, even if no default is set in PPOMA_BBP.

This is the expected behaviour. When storage locations are configured in PPOMA_BBP, even if no default is configured, system will consider the first storage location from the list and assign it to the shopping cart (respecting the combination of plant/company code).

This logic takes place in method STG_LOC_GET_DEFAULT of class /SAPSRM/CL_PDO_SHARED_USER (topic 2.3):  

ELSE.
* 2.2 no default storage location => check if other stor.loc. exists
        READ TABLE it_storage_location INTO ls_storage_location
                 WITH KEY plant   = iv_location
                          logsys  = iv_log_system.

        IF sy–subrc = 0.
* 2.3 take first storage location as default
          cv_default_storage_location = ls_storage_location–store_loc.
        ELSE.
          CLEAR cv_default_storage_location.  ” not available
        ENDIF.

      ENDIF. “sy-subrc 1.1
    ENDIF. “cv_default_storage_location

For more information, read wiki page http://wiki.scn.sap.com/wiki/x/WIlKF.