what i meant is, just call the modify method of core class. before using the get related entities method in the on new focus method.
lr_core type ref to cl_crm_bol_core.
lr_core = cl_crm_bol_core =>get_instance( ).
lr_core->modify( ).
then call your get related entities.
lv_collection = parent_entity->get_related_entities(
iv_relation_name = 'PDPStatusRel' ).