This might help. We store the ID for the object from the external SOR.
- Managing external system of record through REST with CRUD actions in Pega Constellation - Knowledge Share - Pega Forums for integrating with SOR
- Constellation 101 has a whole section on Search and Select, configure the SOR from the Data Object correctly and there is little you have to do for the “showing results” or “storing selected item(s)”.
If you are having trouble, I would suggest starting a new thread on User Experience - Pega Forums and tag kamil/myself referring to this.