diff --git a/PYEGERIA_ISSUES.md b/PYEGERIA_ISSUES.md
index 395a45cf..1ef10f1a 100644
--- a/PYEGERIA_ISSUES.md
+++ b/PYEGERIA_ISSUES.md
@@ -1121,8 +1121,14 @@ into the entry now, so it isn't rediscovered from scratch later.
 
 ### ISSUE-126: `ProductManager` and `DigitalBusiness` never set `collection_command_root`, so every inherited `CollectionManager` method that uses it raises `AttributeError`
 
-**Layer:** pyegeria · **Status:** open, logged only, not fixed (awaiting approval) · **Found:** 2026-10-05,
-live cleanup of a throwaway data contract (PR #427's live check).
+**Layer:** pyegeria · **Status:** fixed on branch `fix/issue-126-127-collection-manager-subclasses`
+(2026-10-05), pending PR/merge · **Found:** 2026-10-05, live cleanup of a throwaway data contract (PR #427's
+live check).
+
+**Fix + scope (2026-10-05):** both constructors now call `CollectionManager.__init__`, as `GlossaryManager`
+does; that also restores `metadata_expert_command_root`, which the SmartQuery relationship methods use. An AST scan of all 91 classes in
+`pyegeria/omvs/` found no other subclass whose `__init__` skips its base's, and
+`test_every_omvs_subclass_runs_its_base_constructor` now fails if one ever does.
 
 **What:** `ProductManager.__init__` and `DigitalBusiness.__init__` call `ServerClient.__init__` directly instead
 of `CollectionManager.__init__` (`GlossaryManager` does it correctly). `CollectionManager.__init__` is what sets
@@ -1142,8 +1148,17 @@ constructs each `CollectionManager` subclass and asserts the attribute exists wo
 
 ### ISSUE-127: `CollectionManager.delete_collection(cascade=True)` silently never sends `cascadeDelete` -- same shape as ISSUE-62
 
-**Layer:** pyegeria · **Status:** open, logged only, not fixed (awaiting approval) · **Found:** 2026-10-05, found
-by capturing the request body while diagnosing a failed cleanup.
+**Layer:** pyegeria · **Status:** fixed on branch `fix/issue-126-127-collection-manager-subclasses`
+(2026-10-05), pending PR/merge · **Found:** 2026-10-05, found by capturing the request body while diagnosing a
+failed cleanup.
+
+**Fix + scope (2026-10-05):** a scan of all 42 callers of `_async_delete_element_request` found exactly two
+that pre-fill a default body *and* pass a cascade flag: `CollectionManager._async_delete_collection` and
+`ProductManager._async_delete_digital_product` (so `delete_digital_product(cascade=True)` was never cascading
+either -- the live check's own product cleanup included). Both now pass `None` so the helper applies the flag.
+`delete_digital_product`'s docstring sample also used the wrong key (`cascadedDelete`); corrected. The helper
+itself is unchanged: a caller that passes an explicit body dict *and* `cascade=True` still gets the body's
+value, which is documented behaviour ("body supersedes").
 
 **What:** `_async_delete_collection` always pre-fills `body = {"class": "DeleteElementRequestBody"}` when none is
 given and hands that dict to `_async_delete_element_request(url, body, cascade)`.
diff --git a/pyegeria/omvs/collection_manager.py b/pyegeria/omvs/collection_manager.py
index b92401fa..420338b5 100644
--- a/pyegeria/omvs/collection_manager.py
+++ b/pyegeria/omvs/collection_manager.py
@@ -6567,8 +6567,8 @@ async def _async_delete_collection(self, collection_guid: str, body: dict | Dele
 
 
         """
-        if body is None:
-            body = {"class": "DeleteElementRequestBody"}
+        # No default body here: _async_delete_element_request applies `cascade` only when it builds the body
+        # itself, so a pre-filled dict made `cascade=True` a silent no-op (ISSUE-127).
         url = f"{self.collection_command_root}/{collection_guid}/delete"
         await self._async_delete_element_request(url, body, cascade)
         logger.info(f"Deleted collection {collection_guid} with cascade {cascade}")
diff --git a/pyegeria/omvs/digital_business.py b/pyegeria/omvs/digital_business.py
index e9152f1b..85c91b70 100644
--- a/pyegeria/omvs/digital_business.py
+++ b/pyegeria/omvs/digital_business.py
@@ -85,7 +85,7 @@ def __init__(
         user_pwd: Optional[str] = None,
         token: Optional[str] = None,
         timeout: int = None):
-        ServerClient.__init__(self, view_server, platform_url, user_id, user_pwd, token, timeout=timeout)
+        CollectionManager.__init__(self, view_server, platform_url, user_id, user_pwd, token, timeout=timeout)
         self.view_server = self.server_name
         self.platform_url = self.platform_url
         self.user_id = self.user_id
diff --git a/pyegeria/omvs/product_manager.py b/pyegeria/omvs/product_manager.py
index 7f38fefd..41b52235 100644
--- a/pyegeria/omvs/product_manager.py
+++ b/pyegeria/omvs/product_manager.py
@@ -92,7 +92,7 @@ def __init__(
         user_pwd: Optional[str] = None,
         token: Optional[str] = None,
         timeout: int = None):
-        ServerClient.__init__(self, view_server, platform_url, user_id, user_pwd, token, timeout=timeout)
+        CollectionManager.__init__(self, view_server, platform_url, user_id, user_pwd, token, timeout=timeout)
         self.view_server = self.server_name
         self.platform_url = self.platform_url
         self.user_id = self.user_id
@@ -322,12 +322,12 @@ async def _async_delete_digital_product(
         ```json
         {
           "class": "DeleteElementRequestBody",
-          "cascadedDelete": false
+          "cascadeDelete": false
         }
         ```
         """
-        if body is None:
-            body = {"class": "DeleteElementRequestBody"}
+        # No default body here: _async_delete_element_request applies `cascade` only when it builds the body
+        # itself, so a pre-filled dict made `cascade=True` a silent no-op (ISSUE-127).
         url = f"{self.product_manager_command_root}/collections/{digital_product_guid}/delete"
         await self._async_delete_element_request(url, body, cascade)
         logger.info(f"Deleted digital product {digital_product_guid} with cascade {cascade}")
@@ -364,7 +364,7 @@ def delete_digital_product(
         ```json
         {
           "class": "DeleteElementRequestBody",
-          "cascadedDelete": false
+          "cascadeDelete": false
         }
         ```
         """
diff --git a/tests/micro-tests/test_collection_manager_subclasses.py b/tests/micro-tests/test_collection_manager_subclasses.py
new file mode 100644
index 00000000..c037da0e
--- /dev/null
+++ b/tests/micro-tests/test_collection_manager_subclasses.py
@@ -0,0 +1,118 @@
+"""
+ISSUE-126: ProductManager and DigitalBusiness called ServerClient.__init__ instead of
+CollectionManager.__init__, so collection_command_root (used by 27 inherited methods) was never set.
+ISSUE-127: delete_collection / delete_digital_product pre-filled a body dict, so the shared helper
+silently ignored cascade=True.
+"""
+import ast
+import glob
+import json
+import os
+
+import pytest
+
+from pyegeria.omvs.collection_manager import CollectionManager
+from pyegeria.omvs.digital_business import DigitalBusiness
+from pyegeria.omvs.glossary_manager import GlossaryManager
+from pyegeria.omvs.product_manager import ProductManager
+
+OMVS_DIR = os.path.join(os.path.dirname(__file__), "..", "..", "pyegeria", "omvs")
+
+
+def test_every_omvs_subclass_runs_its_base_constructor():
+    """Structural guard for the whole bug class: a client that derives from another OMVS client but whose
+    __init__ never calls that client's __init__ silently misses the attributes it sets."""
+    classes = {}
+    for path in sorted(glob.glob(os.path.join(OMVS_DIR, "*.py"))):
+        for node in ast.parse(open(path).read()).body:
+            if not isinstance(node, ast.ClassDef):
+                continue
+            bases = [b.id for b in node.bases if isinstance(b, ast.Name)]
+            init = next((m for m in node.body if isinstance(m, ast.FunctionDef) and m.name == "__init__"), None)
+            called = set()
+            if init:
+                for call in ast.walk(init):
+                    if isinstance(call, ast.Call) and isinstance(call.func, ast.Attribute) and call.func.attr == "__init__":
+                        owner = call.func.value
+                        called.add(owner.id if isinstance(owner, ast.Name) else "super()")
+            classes[node.name] = (bases, init is not None, called)
+
+    offenders = [f"{name} (skips {base}.__init__)"
+                 for name, (bases, has_init, called) in classes.items() if has_init
+                 for base in bases
+                 if base in classes and base != "ServerClient" and base not in called and "super()" not in called]
+    assert offenders == []
+
+
+@pytest.mark.parametrize("cls", [CollectionManager, GlossaryManager, ProductManager, DigitalBusiness])
+def test_collection_manager_subclasses_have_the_collection_roots(cls, monkeypatch):
+    monkeypatch.setattr(cls, "check_connection", lambda self: "test")
+    client = cls("view-server", "https://localhost:1", "user", "pwd")
+
+    assert client.collection_command_root.endswith("/api/open-metadata/collection-manager/collections")
+    assert client.metadata_expert_command_root.endswith("/api/open-metadata/metadata-expert")
+
+
+def test_each_subclass_keeps_its_own_root(monkeypatch):
+    monkeypatch.setattr(ProductManager, "check_connection", lambda self: "test")
+    monkeypatch.setattr(DigitalBusiness, "check_connection", lambda self: "test")
+
+    assert ProductManager("v", "https://localhost:1", "u", "p").product_manager_command_root.endswith("/product-manager")
+    assert DigitalBusiness("v", "https://localhost:1", "u", "p").digital_business_command_root.endswith("/digital-business")
+
+
+# --- ISSUE-127 ------------------------------------------------------------------------------
+
+class _Response:
+    def json(self):
+        return {"relatedHTTPCode": 200}
+
+
+def _capture(cls, monkeypatch):
+    monkeypatch.setattr(cls, "check_connection", lambda self: "test")
+    client = cls("view-server", "https://localhost:1", "user", "pwd")
+    calls: list = []
+
+    async def fake_make_request(method, url, payload=None, *args, **kwargs):
+        calls.append({"url": url, "body": json.loads(payload) if isinstance(payload, str) else payload})
+        return _Response()
+
+    client._async_make_request = fake_make_request
+    return client, calls
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("cls, method, tail", [
+    (CollectionManager, "_async_delete_collection", "/collections/g1/delete"),
+    (ProductManager, "_async_delete_collection", "/collections/g1/delete"),   # inherited; was broken by ISSUE-126
+    (DigitalBusiness, "_async_delete_collection", "/collections/g1/delete"),  # likewise
+    (ProductManager, "_async_delete_digital_product", "/collections/g1/delete"),
+])
+async def test_cascade_true_reaches_the_server(cls, method, tail, monkeypatch):
+    client, calls = _capture(cls, monkeypatch)
+
+    await getattr(client, method)("g1", cascade=True)
+
+    assert calls[0]["url"].endswith(tail)
+    assert calls[0]["body"]["cascadeDelete"] is True
+    assert calls[0]["body"]["class"] == "DeleteElementRequestBody"
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("method", ["_async_delete_collection", "_async_delete_digital_product"])
+async def test_cascade_default_does_not_cascade(method, monkeypatch):
+    client, calls = _capture(ProductManager, monkeypatch)
+
+    await getattr(client, method)("g1")
+
+    assert calls[0]["body"].get("cascadeDelete") in (None, False)
+
+
+@pytest.mark.asyncio
+async def test_an_explicit_body_is_still_honoured(monkeypatch):
+    client, calls = _capture(CollectionManager, monkeypatch)
+    body = {"class": "DeleteElementRequestBody", "cascadeDelete": True, "deleteMethod": "PURGE"}
+
+    await client._async_delete_collection("g1", body=body)
+
+    assert calls[0]["body"]["cascadeDelete"] is True and calls[0]["body"]["deleteMethod"] == "PURGE"