Interaction record created without 'anchor'

Hi all

while creating an interaction record using the following code, where Z001 is a transaction code for IR

    lo_bol_core = cl_crm_bol_core=>get_instance( ).

    lo_bol_core->start_up( 'BT' ).

   ls_params-name   = 'PROCESS_TYPE'.

   ls_params-value  = 'Z001'.

   append ls_params to lt_params.

    call method lo_bol_core->root_create

      exporting

        iv_object_name  = 'BTOrder'

        iv_create_param = lt_params

        iv_number       = 1

      receiving

        rv_result       = lo_btorder_col.

*

    lo_btorder = lo_btorder_col->get_current( ).

I get an IR created without 'anchor', it means without the following relation created which it is supposed to be done automatically by the system

BTORDER -> BTADMINH -> BTHeaderDocFlowSet -> BTDocFlowAll -> BTDocFlow

and the following property created

OBJTYPE_B = CRMCICANCH

Any advise?

Regards

MG