Example to get value attribute 'GUID' from entity btadminh entity.
DATA: lr_current TYPE REF TO cl_crm_bol_entity,
lv_guid TYPE CRMT_OBJECT_GUID.
lr_current ?= me->typed_context->btadminh->collection_wrapper->get_current( ).
TRY.
CALL METHOD lr_current->if_bol_bo_property_access~get_property_as_value
EXPORTING
iv_attr_name = 'GUID'
IMPORTING
ev_result = lv_guid.
CATCH cx_root.
ENDTRY.