diff --git a/contract/i18n/contract.pot b/contract/i18n/contract.pot
index 4af1471ae..30c56f184 100644
--- a/contract/i18n/contract.pot
+++ b/contract/i18n/contract.pot
@@ -256,7 +256,7 @@ msgid "Cancel allowed?"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:1027
+#: code:addons/contract/models/contract_line.py:1040
 #, python-format
 msgid "Cancel not allowed for this line"
 msgstr ""
@@ -392,13 +392,13 @@ msgid "Contract Type"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:614
+#: code:addons/contract/models/contract_line.py:627
 #, python-format
 msgid "Contract line '%s' start date can't be later than end date"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:1056
+#: code:addons/contract/models/contract_line.py:1069
 #, python-format
 msgid "Contract line Un-canceled: %s<br/>- "
 msgstr ""
@@ -416,13 +416,13 @@ msgid "Contract line and its successor overlapped"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:1035
+#: code:addons/contract/models/contract_line.py:1048
 #, python-format
 msgid "Contract line canceled: %s<br/>- "
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:827
+#: code:addons/contract/models/contract_line.py:840
 #, python-format
 msgid "Contract line for <strong>{product}</strong>\n"
 "                            stopped: <br/>\n"
@@ -431,7 +431,7 @@ msgid "Contract line for <strong>{product}</strong>\n"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:907
+#: code:addons/contract/models/contract_line.py:920
 #, python-format
 msgid "Contract line for <strong>{product}</strong>\n"
 "                    planned a successor: <br/>\n"
@@ -442,7 +442,7 @@ msgid "Contract line for <strong>{product}</strong>\n"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:1203
+#: code:addons/contract/models/contract_line.py:1216
 #, python-format
 msgid "Contract line for <strong>{product}</strong>\n"
 "                renewed: <br/>\n"
@@ -453,7 +453,7 @@ msgid "Contract line for <strong>{product}</strong>\n"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:1015
+#: code:addons/contract/models/contract_line.py:1028
 #, python-format
 msgid "Contract line for <strong>{product}</strong>\n"
 "                suspended: <br/>\n"
@@ -464,7 +464,7 @@ msgid "Contract line for <strong>{product}</strong>\n"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:1253
+#: code:addons/contract/models/contract_line.py:1266
 #, python-format
 msgid "Contract line must be canceled before delete"
 msgstr ""
@@ -986,7 +986,7 @@ msgid "Plan successor allowed?"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:890
+#: code:addons/contract/models/contract_line.py:903
 #, python-format
 msgid "Plan successor not allowed for this line"
 msgstr ""
@@ -1208,7 +1208,7 @@ msgid "Stop allowed?"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:807
+#: code:addons/contract/models/contract_line.py:820
 #, python-format
 msgid "Stop not allowed for this line"
 msgstr ""
@@ -1219,7 +1219,7 @@ msgid "Stop/Plan successor allowed?"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:951
+#: code:addons/contract/models/contract_line.py:964
 #, python-format
 msgid "Stop/Plan successor not allowed for this line"
 msgstr ""
@@ -1311,7 +1311,7 @@ msgid "Un-cancel"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:1048
+#: code:addons/contract/models/contract_line.py:1061
 #, python-format
 msgid "Un-cancel not allowed for this line"
 msgstr ""
@@ -1402,7 +1402,7 @@ msgid "Year(s)"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:774
+#: code:addons/contract/models/contract_line.py:787
 #, python-format
 msgid "You can't delay a contract line invoiced at least one time."
 msgstr ""
@@ -1414,19 +1414,25 @@ msgid "You can't have a date of next invoice anterior to the start of the contra
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:585
+#: code:addons/contract/models/contract_line.py:587
 #, python-format
 msgid "You can't have the end date before the date of last invoice for the contract line '%s'"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:577
+#: code:addons/contract/models/contract_line.py:598
+#, python-format
+msgid "You can't have the next invoice date before the date of last invoice for the contract line '%s'"
+msgstr ""
+
+#. module: contract
+#: code:addons/contract/models/contract_line.py:579
 #, python-format
 msgid "You can't have the start date after the date of last invoice for the contract line '%s'"
 msgstr ""
 
 #. module: contract
-#: code:addons/contract/models/contract_line.py:601
+#: code:addons/contract/models/contract_line.py:614
 #, python-format
 msgid "You must supply a date of next invoice for contract line '%s'"
 msgstr ""