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For project reason I need to figure out the logic how the field list is assembled when folder “Attributes” for a given context node is expanded in CRM WebClient UI workbench:
Debugging entry point is CL_BSP_WD_GUI_LIST_TREE~ON_EXPAND_NO_CHILDREN´╝Ü
There are three kinds of fields which will appear under “Attributes” folder:

1. direct attribute

get the public method list of context node class with naming convention that method name starts with GET_, and have one importing parameter ATTRIBUTE_PATH and one returning parameter VALUE.
And then extract the attribute name and stored it to internal table lt_direct_attribute.
Once the direct attribute of the current context node class has been extracted, there is a recursive call with the same extraction logic on the super class.
Since I am using UI component BT116H_SRVO, context node BTADMH to debug, the inheritance hierarchy from children to parent in this example is:
CL_BT116H_S_DETAILS_CN00 -> CL_CRM_UIU_BTADMINH_CN -> CL_CRM_UIU_BT_EASYCNDENTRY_FCN -> CL_BSP_WD_CONTEXT_NODE -> CL_BSP_MODEL
For example, there is a method GET_BILL_BLOCK_STATUS with the specified signature,
so BILL_BLOCK_STATUS is regarded as one direct attribute for this context node:

2. implicit attribute

Retrieved from method get_implicite_cnode_attr,
Attributes defined in DDIC structure CRMST_ADMINH_BTIL are regarded as implicit attribute.
This structure is bound to context node BTAdminH in Genil model editor.

3. AET attribute ( Application Enhancement Tool )

In fact AET attribute could be regarded as a special kind of implicit attribute as it is physically appended to EEW structure just the same way as implicit attribute. AET fields are retrieved via method get_extension_cnode_attr:
Those fields are retrieved with API cl_axt_uif_access=>get_ext_attributes and marked with prefix EXT in UI component workbench:
You can use the following report to print out the attribute list of a given UI component’s context node:
REPORT zget_ui_context_node_attr.

PARAMETERS: comp TYPE string OBLIGATORY DEFAULT 'BT116H_SRVO',
            cs   TYPE string OBLIGATORY DEFAULT 'CL_BT116H_S_DETAILS_CN00'.

DATA(lo_model) = cl_bsp_wd_appl_model=>get_appl_model(
      EXPORTING  iv_bsp_appl = CONV #( comp )
                  iv_model_type      = 'CL_BSP_WD_APPL_MODEL_DDIC' ).
DATA(lt_attr) = lo_model->get_context_node_attr( iv_context_node_class  = CONV #( cs )
  iv_mark_ext_attributes = 'X' ).

LOOP AT lt_attr ASSIGNING FIELD-SYMBOL(<attr>).
  WRITE:/ <attr>.
ENDLOOP.
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