diff --git a/beancount_import/matching.py b/beancount_import/matching.py
index 54bde06a..f9f5710c 100644
--- a/beancount_import/matching.py
+++ b/beancount_import/matching.py
@@ -314,7 +314,7 @@ def search_postings(self,
                         negate=False) -> Iterable[SearchPosting]:
         # Prepare postings for searching
         postings_date_currency = collections.defaultdict(list)
-        
+
         for mp in mps:
             weight = get_posting_weight(mp.posting)
             if weight is None:
@@ -1489,8 +1489,9 @@ def get_combined_transactions(txns: Tuple[Transaction, Transaction],
     for match_sets in itertools.product(*match_groups.values()):
         combined_matches = sum((match_set.matches for match_set in match_sets),
                                [])  # type: PostingMatches
-        combined_removals = sum((match_set.removals
-                                 for match_set in match_sets), ())
+        combined_removals: MatchablePostings = tuple(removal
+                                                    for match_set in match_sets
+                                                    for removal in match_set.removals)
         if not combined_matches:
             continue
         for m in combined_matches:
diff --git a/beancount_import/source/amazon_invoice.py b/beancount_import/source/amazon_invoice.py
index 8dd48ef9..608cf357 100644
--- a/beancount_import/source/amazon_invoice.py
+++ b/beancount_import/source/amazon_invoice.py
@@ -29,7 +29,7 @@
     |
     +-> returns Order
 """
-from typing import NamedTuple, Optional, List, Union, Iterable, Dict, Sequence, cast
+from typing import NamedTuple, Optional, List, Union, Iterable, Dict, Sequence, cast, Type
 from abc import ABC, abstractmethod
 import collections
 import re
@@ -293,7 +293,7 @@ def parse_date(date_str) -> datetime.date:
         return dateutil.parser.parse(date_str, parserinfo=Locale_de_DE._parserinfo(dayfirst=True)).date()
 
 
-LOCALES = {x.LOCALE: x for x in [Locale_en_US, Locale_de_DE]}
+LOCALES: Dict[str, Type[Locale_Data]] = {x.LOCALE: x for x in [Locale_en_US, Locale_de_DE]}
 
 Errors = List[str]
 Adjustment = NamedTuple('Adjustment', [