we can also save line with 'mixed' letter

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@14933 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_banking_core/SkinTemplateItem/portal_skins/erp5_banking_core/CashDetail_saveFastInputLine.xml

@@ -196,7 +196,7 @@ for resource_id in per_resource_dict.keys():\n
         variation_not_defined = 1\n
         break\n
     # for the letter, if coin, must always be not_defined\n
-    if letter != \'emission_letter/not_defined\' and letter.replace(\'emission_letter/\',\'\') not in resource_object.getEmissionLetterList():\n
+    if letter != \'emission_letter/not_defined\' and letter.replace(\'emission_letter/\',\'\') not in resource_object.getEmissionLetterList()+[\'mixed\']:\n
       old_letter = letter\n
       letter = \'emission_letter/not_defined\'\n
       # replace key in per_resource_dict\n

bt5/erp5_banking_core/bt/revision

-278
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+282
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