--- a/pallets/common/src/erc.rs
+++ b/pallets/common/src/erc.rs
@@ -97,7 +97,7 @@
 			.confirm_sponsorship(caller.as_sub())
 			.map_err(dispatch_to_evm::<T>)?
 		{
-			return Err(Error::Revert("Caller is not set as sponsor".into()));
+			return Err("Caller is not set as sponsor".into());
 		}
 		save(self)
 	}
--- a/pallets/unique/src/lib.rs
+++ b/pallets/unique/src/lib.rs
@@ -491,7 +491,7 @@
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
 
 			let mut target_collection = <CollectionHandle<T>>::try_get(collection_id)?;
-			target_collection.check_is_owner(&sender)?;
+			target_collection.check_is_owner_or_admin(&sender)?;
 			target_collection.check_is_internal()?;
 
 			target_collection.set_sponsor(new_sponsor.clone())?;
@@ -867,7 +867,7 @@
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
 			let mut target_collection = <CollectionHandle<T>>::try_get(collection_id)?;
 			target_collection.check_is_internal()?;
-			target_collection.check_is_owner(&sender)?;
+			target_collection.check_is_owner_or_admin(&sender)?;
 			let old_limit = &target_collection.limits;
 
 			target_collection.limits = <PalletCommon<T>>::clamp_limits(target_collection.mode.clone(), &old_limit, new_limit)?;
@@ -889,7 +889,7 @@
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
 			let mut target_collection = <CollectionHandle<T>>::try_get(collection_id)?;
 			target_collection.check_is_internal()?;
-			target_collection.check_is_owner(&sender)?;
+			target_collection.check_is_owner_or_admin(&sender)?;
 			let old_limit = &target_collection.permissions;
 
 			target_collection.permissions = <PalletCommon<T>>::clamp_permissions(target_collection.mode.clone(), &old_limit, new_limit)?;