Exception while defining value attribute to Model Node

Hello Friends,

I have added value attribute to an existing context node in component BT121H_SLSC,  BTPARTNERSET context node. Now after adding the value attribute an exception is triggering as

"Source type \CLASS=CL_BSP_WD_MIXED_NODE is not compatible, for the purposes of assignment, with target type \CLASS=CL_CRM_BOL_ENTITY"

I have checked  source code of mentioned class, reference of CL_BSP_WD_MIXED_NODE class is coming after adding value attribute .

Exception is triggering at statement: lr_entity ?= current. => In current ref of CL_BSP_WD_MIXED_NODE class is coming while lr_entity is type ref to cl_crm_bol_entity.

I would really appriciate your reply on this as how can I avoid this exception? Do I need to redfine this method?

Appriciate your replies on same.

Regards,

CRM Dev