diff --git a/src/keria/app/specing.py b/src/keria/app/specing.py
index fd3eeebf..8368bcd6 100644
--- a/src/keria/app/specing.py
+++ b/src/keria/app/specing.py
@@ -881,18 +881,6 @@ def __init__(self, app, title, version="1.0.1", openapi_version="3.1.0"):
                 {"$ref": "#/components/schemas/ACDC_V_2"},
             ]
         }
-        self.spec.components.schemas["CredentialOperationMetadata"]["properties"][
-            "depends"
-        ] = {
-            "oneOf": [
-                {"$ref": "#/components/schemas/ROT_V_1"},
-                {"$ref": "#/components/schemas/ROT_V_2"},
-                {"$ref": "#/components/schemas/DRT_V_1"},
-                {"$ref": "#/components/schemas/DRT_V_2"},
-                {"$ref": "#/components/schemas/IXN_V_1"},
-                {"$ref": "#/components/schemas/IXN_V_2"},
-            ]
-        }
         self.spec.components.schema(
             "CredentialOperationResponse",
             schema=marshmallow_dataclass.class_schema(
@@ -968,13 +956,7 @@ def __init__(self, app, title, version="1.0.1", openapi_version="3.1.0"):
         )
         self.spec.components.schemas["DelegatorOperationMetadata"]["properties"][
             "depends"
-        ] = {
-            "oneOf": [
-                {"$ref": "#/components/schemas/GroupOperation"},
-                {"$ref": "#/components/schemas/WitnessOperation"},
-                {"$ref": "#/components/schemas/DoneOperation"},
-            ]
-        }
+        ] = {"$ref": "#/components/schemas/KelOperation"}
 
         self.spec.components.schema(
             "PendingDelegatorOperation",
@@ -1002,6 +984,21 @@ def __init__(self, app, title, version="1.0.1", openapi_version="3.1.0"):
             ]
         }
 
+        self.spec.components.schemas["KelOperation"] = {
+            "oneOf": [
+                {"$ref": "#/components/schemas/GroupOperation"},
+                {"$ref": "#/components/schemas/WitnessOperation"},
+                {"$ref": "#/components/schemas/DoneOperation"},
+                {"$ref": "#/components/schemas/DelegationOperation"},
+            ]
+        }
+        self.spec.components.schemas["RegistryOperationMetadata"]["properties"][
+            "depends"
+        ] = {"$ref": "#/components/schemas/KelOperation"}
+        self.spec.components.schemas["CredentialOperationMetadata"]["properties"][
+            "depends"
+        ] = {"$ref": "#/components/schemas/KelOperation"}
+
         self.spec.components.schemas["Operation"] = {
             "oneOf": [
                 {"$ref": "#/components/schemas/OOBIOperation"},
diff --git a/src/keria/core/optypes.py b/src/keria/core/optypes.py
index e89ac299..d9092fb5 100644
--- a/src/keria/core/optypes.py
+++ b/src/keria/core/optypes.py
@@ -333,6 +333,14 @@ class FailedGroupOperation(BaseGroupOperation, FailedOperation):
 ]
 
 
+KelOperation = Union[
+    "GroupOperation",
+    "WitnessOperation",
+    "DoneOperation",
+    "DelegationOperation",
+]
+
+
 @dataclass
 class DelegatorOperationMetadata:
     pre: str
@@ -345,7 +353,7 @@ class DelegatorOperationMetadata:
             )
         },
     )
-    depends: Union["GroupOperation", "WitnessOperation", "DoneOperation"] = None  # type: ignore
+    depends: KelOperation = None  # type: ignore
 
 
 @dataclass
@@ -597,9 +605,7 @@ class FailedChallengeOperation(BaseChallengeOperation, FailedOperation):
 @dataclass
 class RegistryOperationMetadata:
     pre: str
-    depends: Union[
-        "GroupOperation", "WitnessOperation", "DoneOperation", "DelegationOperation"
-    ]
+    depends: KelOperation = None  # type: ignore
     anchor: Anchor = field(
         default_factory=Anchor,
         metadata={
@@ -667,7 +673,7 @@ class FailedRegistryOperation(BaseRegistryOperation, FailedOperation):
 @dataclass
 class CredentialOperationMetadata:
     ced: Union[ACDC_V_1, ACDC_V_2]  # type: ignore
-    depends: Union[ROT_V_1, ROT_V_2, DRT_V_1, DRT_V_2, IXN_V_1, IXN_V_2] = None  # type: ignore
+    depends: KelOperation = None  # type: ignore
 
 
 @dataclass