diff --git a/pkg/scd/operational_intents_handler.go b/pkg/scd/operational_intents_handler.go
index e8e4d6e53..339ee6b4b 100644
--- a/pkg/scd/operational_intents_handler.go
+++ b/pkg/scd/operational_intents_handler.go
@@ -365,7 +365,7 @@ func (a *Server) UpdateOperationalIntentReference(ctx context.Context, req *rest
 
 type validOIRParams struct {
 	id             dssmodels.ID
-	ovn            restapi.EntityOVN
+	ovn            scdmodels.OVN
 	state          scdmodels.OperationalIntentState
 	extents        []*dssmodels.Volume4D
 	uExtent        *dssmodels.Volume4D
@@ -446,7 +446,7 @@ func validateAndReturnUpsertParams(
 	if ovn == "" && params.State != restapi.OperationalIntentState_Accepted {
 		return nil, stacktrace.NewError("Invalid state for initial version: `%s`", params.State)
 	}
-	valid.ovn = ovn
+	valid.ovn = scdmodels.OVN(ovn)
 
 	if params.SubscriptionId != nil {
 		valid.subscriptionID, err = dssmodels.IDFromOptionalString(string(*params.SubscriptionId))
@@ -493,7 +493,7 @@ func checkUpsertPermissionsAndReturnManager(authorizedManager *api.Authorization
 //   - otherwise, it is the version of the previous OIR
 func validateUpsertRequestAgainstPreviousOIR(
 	requestingManager dssmodels.Manager,
-	providedOVN restapi.EntityOVN,
+	providedOVN scdmodels.OVN,
 	previousOIR *scdmodels.OperationalIntent,
 ) error {
 
@@ -502,7 +502,7 @@ func validateUpsertRequestAgainstPreviousOIR(
 			return stacktrace.NewErrorWithCode(dsserr.PermissionDenied,
 				"OperationalIntent owned by %s, but %s attempted to modify", previousOIR.Manager, requestingManager)
 		}
-		if previousOIR.OVN != scdmodels.OVN(providedOVN) {
+		if previousOIR.OVN != providedOVN {
 			return stacktrace.NewErrorWithCode(dsserr.VersionMismatch,
 				"Current version is %s but client specified version %s", previousOIR.OVN, providedOVN)
 		}
@@ -627,16 +627,18 @@ func (a *Server) upsertOperationalIntentReference(ctx context.Context, authorize
 		if err != nil {
 			return stacktrace.Propagate(err, "Could not get OperationalIntent from repo")
 		}
-		// Validate the request against the previous OIR and return the current version
-		// (upon new OIR creation, version is 0)
+		// Validate the request against the previous OIR
 		if err := validateUpsertRequestAgainstPreviousOIR(manager, validParams.ovn, old); err != nil {
 			return stacktrace.PropagateWithCode(err, stacktrace.GetCode(err), "Request validation failed")
 		}
 
-		// For an OIR being created, version starts at 0
-		version := int32(0)
+		var (
+			version  = scdmodels.VersionNumber(1)
+			pastOVNs = []scdmodels.OVN{validParams.ovn}
+		)
 		if old != nil {
-			version = int32(old.Version)
+			version = old.Version + 1
+			pastOVNs = append(old.PastOVNs, validParams.ovn)
 		}
 
 		var sub *scdmodels.Subscription
@@ -739,9 +741,11 @@ func (a *Server) upsertOperationalIntentReference(ctx context.Context, authorize
 
 		// Construct the new OperationalIntent
 		op := &scdmodels.OperationalIntent{
-			ID:      validParams.id,
-			Manager: manager,
-			Version: scdmodels.VersionNumber(version + 1),
+			ID:       validParams.id,
+			Manager:  manager,
+			Version:  version,
+			OVN:      "", // TODO dss#1078: this field must be populated to support USSs setting OVNs in advance
+			PastOVNs: pastOVNs,
 
 			StartTime:     validParams.uExtent.StartTime,
 			EndTime:       validParams.uExtent.EndTime,