Creation of Interaction Record

Hello,

We are implementing Interaction Center and one of the project steps is a migration from legacy system to SAP CRM.

I'm trying to create interaction records (below picture) via BAPI_ACTIVITYCRM_CREATEMULTI. My development was based on standard function module ECRM_ISU_CREATE_ACTIVITY.

However I'm getting another kind of document as shown in the picture below.

Could you please help me find what's getting wrong? Shoud I use another BAPI instead?

Thank you!

Diego