How to add a parameter when executing get_related_entities for relation “BuilOpportunityRel”？

Hi experts,

as we all know,when open an account in CRM WEB UI,the system will list the related oppotunities for this account in assignment block "Opportunities".

I checked the codings,the system fetches the oppotunities by getting relation “BuilOpportunityRel”.

        lv_collection = entity->get_related_entities(

                iv_relation_name = 'BuilOpportunityRel'

                iv_mode          = lv_mode ).

Now, I want to make an enhancement,add a fillter, for example,only list the related opportunities those were created in recent 1 month.

How can I achieve this?

Can anybody give me an instruction?

Thanks.

Jerry.