Valune node - How to access attribute of Value Node

Hi Experts,

I creates a value node ZBP and it has one attribute called BP which I created while creating value node.

I want to access the value of BP. For this I wrote below code :

DATA : lv_wrapper_c     TYPE REF TO cl_bsp_wd_collection_wrapper,         
          entity                   TYPE REF TO cl_crm_bol_entity.

   lv_wrapper_c = ztyped_context->zbp->get_collection_wrapper( ).
   lv_entity_c ?= lv_wrapper_c->get_current( ).

But at line lv_entity_c ?= lv_wrapper_c->get_current( ) it is throwing below exception :

During a 'CAST' operation ('?=' oder 'MOVE ? TO')a type conflict occurred. The source type '\CLASS=CL_BSP_WD_VALUE_NODE' is not compatible for assigning with the target type '\CLASS=CL_CRM_BOL_ENTITY'.

Please help to remove this exception.

Thanks & Regards,

Akhilesh Bhagat.