Marketing Cloud - Interest in Odata CUAN_BUSINESS_DOCUMENT_IMP_SRV

Hi,
we are uploading interactions (sales orders) in Marketing Cloud through Odata service CUAN_BUSINESS_DOCUMENT_IMP_SRV. We would like to load also items of interest to these interactions, but the items of interests are not included in the Odata.

How can we upload item of interests for interactions created by service CUAN_BUSINESS_DOCUMENT_IMP_SRV?

Thanks

Simona