Access data of a context node

Hi

I have enhanced BT111H_OPPT and created a context node BTCustomerH with BOL entity as BTCustomerH. Now I have to access data from this context to set the attribute value in do_prepare_output.

I have entered the code

  lr_entity ?= me->typed_context->btcustomerh->collection_wrapper->get_current( ) . But I am getting error BTCustomerH not found in typed_context.

Should I create any binding or any other changes?

Regards

Geeth