Question

Is nesting supported for Interactions the way it is for Entities?

Answer

Interactions are lightweight objects that represent any kind of interaction or transaction.  Interactions can have attributes that can be of simple, nested and reference types.

Example Interaction Type - Meeting 

{
 "URI": "configuration/interactionTypes/Meeting",
 "id": "31",
 "label": "Meeting",
 "attributes": [{
 "URI": "configuration/interactionTypes/Meeting/attributes/Place",
 "name": "Place",
 "id": "32",
 "label": "Place",
 "type": "String"
 }, 
 {
 "URI": "configuration/interactionTypes/Meeting/attributes/Notes",
 "name": "Notes",
 "id": "33",
 "label": "Notes",
 "type": "String"
 }],
 "memberTypes": [{
 "URI": "configuration/interactionTypes/Meeting/memberTypes/participants",
 "name": "participants",
 "id": "34",
 "label": "participants",
 "objectTypeURI": ["configuration/entityTypes/Individual"],
 "minOccurs": 1
 },
 {
 "URI": "configuration/interactionTypes/Meeting/organizers",
 "name": "organizers",
 "label": "organizers",
 "id": "35",
 "objectTypeURI": ["configuration/entityTypes/Individual"],
 "label": "organizers",
 "minOccurs": 1
 }]
}

Note: Currently, "id" parameters are not supported by Configuration API.

References

https://docs.reltio.com/infoandconfig/interactiontype.html?hl=nested%2Cinteractions
https://docs.reltio.com/infoandconfig/configinteractiontypes.html

https://documentation.reltio.com/infoandconfig/attributeconfig.html