diff --git a/pkg/derr/errors.go b/pkg/derr/errors.go
index 7d5aef8..45ce8df 100644
--- a/pkg/derr/errors.go
+++ b/pkg/derr/errors.go
@@ -57,4 +57,5 @@ var (
 	ErrInvalidRelationIdentifier     = cerr.NewAsertoError("E20047", codes.InvalidArgument, http.StatusBadRequest, "invalid argument relation_identifier")
 	ErrProtoValidate                 = cerr.NewAsertoError("E20050", codes.InvalidArgument, http.StatusBadRequest, "")
 	ErrGraphDirectionality           = cerr.NewAsertoError("E20052", codes.InvalidArgument, http.StatusPreconditionFailed, "unable to determine graph directionality")
+	ErrUnknownOpCode                 = cerr.NewAsertoError("E20053", codes.InvalidArgument, http.StatusPreconditionFailed, "unknown import OpCode value")
 )