you need to debug CRM_MKTBP_READ_BP_DATA, put GUID of the BP into IV_BP_GUID.
In this FM, it will call following FM
CALL FUNCTION 'CRM_MKTBP_READ_KSSK_AUSP'
EXPORTING
IV_BYPASS_BUFFER = IV_BYPASS_BUFFER
TABLES
it_bp_list = lt_bp_list_imp
et_kssk = lt_kssk
et_ausp = lt_ausp
et_bp_list = lt_bp_list.
| LT_KSSK | stores the object ID | [1x19(274)]Standard Table |
| LT_AUSP | stores the attributes and their values | [2x30(432)]Standard Table |
I think LT_AUSP contains values that you want.
You may learn from this exmaple how CRM_MKTBP_READ_KSSK_AUSP is called, and call this FM in your z report to retrieve the marketing attribute values.
Spencer