diff --git a/docs/module.rst b/docs/module.rst
new file mode 100644
index 00000000..e69de29b
diff --git a/scaleway-core/scaleway_core/utils/resolve_one_of.py b/scaleway-core/scaleway_core/utils/resolve_one_of.py
index a829d602..87f1dc5e 100644
--- a/scaleway-core/scaleway_core/utils/resolve_one_of.py
+++ b/scaleway-core/scaleway_core/utils/resolve_one_of.py
@@ -1,5 +1,9 @@
+from collections.abc import Callable
 from dataclasses import dataclass
 from typing import Any, Dict, Generic, List, Optional, TypeVar
+from _typeshed import SupportsKeysAndGetItem
+
+from scaleway_core.profile import ProfileDefaults
 
 T = TypeVar("T")
 
@@ -7,25 +11,31 @@
 @dataclass
 class OneOfPossibility(Generic[T]):
     param: str
-
     value: Optional[T]
-
-    default: Optional[T] = None
+    default: Optional[T | ProfileDefaults] = None
+    marshal_func: Optional[Callable[[T, T | None], Dict[str, Any]]] = None
 
 
 def resolve_one_of(
     possibilities: List[OneOfPossibility[Any]], is_required: bool = False
-) -> Dict[str, Any]:
+) -> SupportsKeysAndGetItem[str, Any]:
     """
     Resolves the ideal parameter and value amongst an optional list.
+    Uses marshal_func if provided.
     """
 
-    # Get the first non-empty parameter
+    # Try to resolve using non-None value
     for possibility in possibilities:
         if possibility.value is not None:
+            if possibility.marshal_func is not None:
+                return {
+                    possibility.param: possibility.marshal_func(
+                        possibility.value, possibility.default
+                    )
+                }
             return {possibility.param: possibility.value}
 
-    # Get the first non-empty default
+    # Try to resolve using non-None default
     for possibility in possibilities:
         if possibility.default is not None:
             if possibility.marshal_func is not None:
@@ -37,12 +47,12 @@ def resolve_one_of(
                 }
             return {possibility.param: possibility.default}
 
-    # If required, raise an error
+    # If required but unresolved, raise an error
     if is_required:
         possibilities_keys = " or ".join(
             [possibility.param for possibility in possibilities]
         )
         raise ValueError(f"one of ${possibilities_keys} must be present")
 
-    # Else, return an empty dict
+    # Else, return empty dict
     return {}