BAPI Or IDOC

Hi All

I was wondering if there is any BAPI , to get the conditions in ( COND_A01) idoc ? The requirement is that with every sales document saved , these condiions need to be passed to a legacy system. I checked with COND_A01 Idoc but Message control can't be set on this IDOC. Is there any other mechanism to pull these conditions out of SAP with every sales transaction ? If there is a BAPI , the legacy system could call this BAPI after evey sales transaction .

Thanks a lot

Sudheer