diff --git a/compensation/models.py b/compensation/models.py
index 990951b2..bc6aaa58 100644
--- a/compensation/models.py
+++ b/compensation/models.py
@@ -298,6 +298,14 @@ class EcoAccount(AbstractCompensation):
         if self.deductable_surface > after_state_sum:
             raise ValidationError(_("Deductable surface can not be larger than existing surfaces in after states"))
 
+        # Deductable surface can not be lower than amount of already deducted surfaces
+        # User needs to contact deducting user in case of further problems
+        deducted_sum = self.get_deductions_surface()
+        if self.deductable_surface < deducted_sum:
+            raise ValidationError(
+                _("Deductable surface can not be smaller than the sum of already existing deductions. Please contact the responsible users for the deductions!")
+            )
+
     def save(self, *args, **kwargs):
         if self.identifier is None or len(self.identifier) == 0:
             # Create new identifier
diff --git a/locale/de/LC_MESSAGES/django.mo b/locale/de/LC_MESSAGES/django.mo
index 2ee53066..25b93fb8 100644
Binary files a/locale/de/LC_MESSAGES/django.mo and b/locale/de/LC_MESSAGES/django.mo differ
diff --git a/locale/de/LC_MESSAGES/django.po b/locale/de/LC_MESSAGES/django.po
index ac54d178..2f954fa3 100644
--- a/locale/de/LC_MESSAGES/django.po
+++ b/locale/de/LC_MESSAGES/django.po
@@ -7,8 +7,8 @@
 #: compensation/forms.py:67 compensation/forms.py:264 compensation/forms.py:345
 #: intervention/filters.py:26 intervention/filters.py:40
 #: intervention/filters.py:47 intervention/filters.py:48
-#: intervention/forms.py:321 intervention/forms.py:333
-#: intervention/forms.py:346 konova/forms.py:108 konova/forms.py:252
+#: intervention/forms.py:322 intervention/forms.py:334
+#: intervention/forms.py:347 konova/forms.py:108 konova/forms.py:252
 #: konova/forms.py:287 konova/forms.py:292 konova/forms.py:304
 #: konova/forms.py:316 konova/forms.py:336 user/forms.py:38
 #, fuzzy
@@ -16,7 +16,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2021-09-17 12:53+0200\n"
+"POT-Creation-Date: 2021-09-20 08:55+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -53,7 +53,7 @@ msgstr "Zahlung wird an diesem Datum erwartet"
 #: ema/templates/ema/detail/includes/actions.html:34
 #: ema/templates/ema/detail/includes/deadlines.html:34
 #: ema/templates/ema/detail/includes/documents.html:31
-#: intervention/forms.py:345
+#: intervention/forms.py:346
 #: intervention/templates/intervention/detail/includes/documents.html:31
 #: intervention/templates/intervention/detail/includes/payments.html:34
 #: intervention/templates/intervention/detail/includes/revocation.html:38
@@ -62,7 +62,7 @@ msgid "Comment"
 msgstr "Kommentar"
 
 #: compensation/forms.py:68 compensation/forms.py:265 compensation/forms.py:346
-#: intervention/forms.py:347 konova/forms.py:317
+#: intervention/forms.py:348 konova/forms.py:317
 msgid "Additional comment, maximum {} letters"
 msgstr "Zusätzlicher Kommentar, maximal {} Zeichen"
 
@@ -97,11 +97,11 @@ msgstr "Biotoptyp wählen"
 #: compensation/templates/compensation/detail/eco_account/includes/states-before.html:36
 #: ema/templates/ema/detail/includes/states-after.html:36
 #: ema/templates/ema/detail/includes/states-before.html:36
-#: intervention/forms.py:478
+#: intervention/forms.py:479
 msgid "Surface"
 msgstr "Fläche"
 
-#: compensation/forms.py:155 intervention/forms.py:480
+#: compensation/forms.py:155 intervention/forms.py:481
 msgid "in m²"
 msgstr ""
 
@@ -133,7 +133,7 @@ msgstr "Fristart wählen"
 #: compensation/templates/compensation/detail/compensation/includes/deadlines.html:31
 #: compensation/templates/compensation/detail/eco_account/includes/deadlines.html:31
 #: ema/templates/ema/detail/includes/deadlines.html:31
-#: intervention/forms.py:320
+#: intervention/forms.py:321
 msgid "Date"
 msgstr "Datum"
 
@@ -245,9 +245,18 @@ msgstr "Stück"
 msgid ""
 "Deductable surface can not be larger than existing surfaces in after states"
 msgstr ""
+"Die abbuchbare Fläche darf die Gesamtfläche der Zielzustände nicht überschreiten"
+
+#: compensation/models.py:306
+msgid ""
+"Deductable surface can not be smaller than the sum of already existing "
+"deductions. Please contact the responsible users for the deductions!"
+msgstr ""
+"Es wurde bereits mehr Fläche abgebucht, als Sie nun als abbuchbar einstellen wollen. "
+"Kontaktieren Sie die für die Abbuchungen verantwortlichen Nutzer!"
 
 #: compensation/tables.py:24 compensation/tables.py:164 ema/tables.py:28
-#: intervention/forms.py:29 intervention/tables.py:23
+#: intervention/forms.py:30 intervention/tables.py:23
 #: intervention/templates/intervention/detail/includes/compensations.html:30
 msgid "Identifier"
 msgstr "Kennung"
@@ -258,7 +267,7 @@ msgstr "Kennung"
 #: compensation/templates/compensation/detail/eco_account/includes/documents.html:28
 #: compensation/templates/compensation/detail/eco_account/view.html:31
 #: ema/tables.py:33 ema/templates/ema/detail/includes/documents.html:28
-#: ema/templates/ema/detail/view.html:24 intervention/forms.py:36
+#: ema/templates/ema/detail/view.html:24 intervention/forms.py:37
 #: intervention/tables.py:28
 #: intervention/templates/intervention/detail/includes/compensations.html:33
 #: intervention/templates/intervention/detail/includes/documents.html:28
@@ -353,7 +362,7 @@ msgstr "Ökokonten"
 
 #: compensation/tables.py:222
 #: compensation/templates/compensation/detail/eco_account/view.html:19
-#: intervention/forms.py:462 intervention/forms.py:469
+#: intervention/forms.py:463 intervention/forms.py:470
 #: konova/templates/konova/home.html:88 templates/navbar.html:34
 msgid "Eco-account"
 msgstr "Ökokonto"
@@ -445,7 +454,7 @@ msgstr "Frist/Termin hinzufügen"
 
 #: compensation/templates/compensation/detail/compensation/includes/deadlines.html:28
 #: compensation/templates/compensation/detail/eco_account/includes/deadlines.html:28
-#: ema/templates/ema/detail/includes/deadlines.html:28 intervention/forms.py:41
+#: ema/templates/ema/detail/includes/deadlines.html:28 intervention/forms.py:42
 msgid "Type"
 msgstr "Typ"
 
@@ -565,7 +574,7 @@ msgstr "Zuletzt bearbeitet"
 
 #: compensation/templates/compensation/detail/compensation/view.html:79
 #: compensation/templates/compensation/detail/eco_account/view.html:78
-#: ema/templates/ema/detail/view.html:69 intervention/forms.py:254
+#: ema/templates/ema/detail/view.html:69 intervention/forms.py:255
 #: intervention/templates/intervention/detail/view.html:111
 msgid "Shared with"
 msgstr "Freigegeben für"
@@ -638,7 +647,7 @@ msgid "Conversation office file number"
 msgstr "Aktenzeichen Naturschutzbehörde"
 
 #: compensation/templates/compensation/detail/eco_account/view.html:66
-#: ema/templates/ema/detail/view.html:50 intervention/forms.py:53
+#: ema/templates/ema/detail/view.html:50 intervention/forms.py:54
 #: intervention/templates/intervention/detail/view.html:59
 msgid "Intervention handler"
 msgstr "Eingriffsverursacher"
@@ -752,120 +761,120 @@ msgstr "Gemarkung"
 msgid "Search for district"
 msgstr "Nach Gemarkung suchen"
 
-#: intervention/forms.py:32
+#: intervention/forms.py:33
 msgid "Generated automatically if none was given"
 msgstr "Wird automatisch erzeugt, falls nicht angegeben"
 
-#: intervention/forms.py:44
+#: intervention/forms.py:45
 msgid "Which intervention type is this"
 msgstr "Welcher Eingriffstyp"
 
-#: intervention/forms.py:47
+#: intervention/forms.py:48
 #: intervention/templates/intervention/detail/view.html:39
 msgid "Law"
 msgstr "Gesetz"
 
-#: intervention/forms.py:50
+#: intervention/forms.py:51
 msgid "Based on which law"
 msgstr "Basiert auf welchem Recht"
 
-#: intervention/forms.py:56
+#: intervention/forms.py:57
 msgid "Who performs the intervention"
 msgstr "Wer führt den Eingriff durch"
 
-#: intervention/forms.py:59
+#: intervention/forms.py:60
 msgid "Data provider"
 msgstr "Datenbereitsteller"
 
-#: intervention/forms.py:61
+#: intervention/forms.py:62
 msgid "Who provides the data for the intervention"
 msgstr "Wer stellt die Daten für den Eingriff zur Verfügung"
 
-#: intervention/forms.py:66
+#: intervention/forms.py:67
 msgid "Organization"
 msgstr "Organisation"
 
-#: intervention/forms.py:72
+#: intervention/forms.py:73
 msgid "Data provider details"
 msgstr "Datenbereitsteller Details"
 
-#: intervention/forms.py:75
+#: intervention/forms.py:76
 msgid "Further details"
 msgstr "Weitere Details"
 
-#: intervention/forms.py:88
+#: intervention/forms.py:89
 msgid "Map"
 msgstr "Karte"
 
-#: intervention/forms.py:90
+#: intervention/forms.py:91
 msgid "Where does the intervention take place"
 msgstr "Wo findet der Eingriff statt"
 
-#: intervention/forms.py:98
+#: intervention/forms.py:99
 msgid "Files"
 msgstr "Dateien"
 
-#: intervention/forms.py:105
+#: intervention/forms.py:106
 msgid "New intervention"
 msgstr "Neuer Eingriff"
 
-#: intervention/forms.py:147
+#: intervention/forms.py:148
 msgid "Edit intervention"
 msgstr "Eingriff bearbeiten"
 
-#: intervention/forms.py:243
+#: intervention/forms.py:244
 msgid "Share link"
 msgstr "Freigabelink"
 
-#: intervention/forms.py:245
+#: intervention/forms.py:246
 msgid "Send this link to users who you want to have writing access on the data"
 msgstr "Andere Nutzer erhalten über diesen Link Zugriff auf die Daten"
 
-#: intervention/forms.py:257
+#: intervention/forms.py:258
 msgid "Remove check to remove access for this user"
 msgstr "Wählen Sie die Nutzer ab, die keinen Zugriff mehr haben sollen"
 
-#: intervention/forms.py:268
+#: intervention/forms.py:269
 #: intervention/templates/intervention/detail/includes/controls.html:15
 msgid "Share"
 msgstr "Freigabe"
 
-#: intervention/forms.py:269
+#: intervention/forms.py:270
 msgid "Share settings for {}"
 msgstr "Freigabe Einstellungen für {}"
 
-#: intervention/forms.py:322
+#: intervention/forms.py:323
 msgid "Date of revocation"
 msgstr "Datum des Widerspruchs"
 
-#: intervention/forms.py:332
+#: intervention/forms.py:333
 #: intervention/templates/intervention/detail/includes/revocation.html:35
 msgid "Document"
 msgstr "Dokument"
 
-#: intervention/forms.py:335 konova/forms.py:305
+#: intervention/forms.py:336 konova/forms.py:305
 msgid "Must be smaller than 15 Mb"
 msgstr "Muss kleiner als 15 Mb sein"
 
-#: intervention/forms.py:358
+#: intervention/forms.py:359
 #: intervention/templates/intervention/detail/includes/revocation.html:18
 msgid "Add revocation"
 msgstr "Widerspruch hinzufügen"
 
-#: intervention/forms.py:398
+#: intervention/forms.py:399
 msgid "Checked intervention data"
 msgstr "Eingriffsdaten geprüft"
 
-#: intervention/forms.py:404
+#: intervention/forms.py:405
 msgid "Checked compensations data and payments"
 msgstr "Kompensationen und Zahlungen geprüft"
 
-#: intervention/forms.py:412
+#: intervention/forms.py:413
 #: intervention/templates/intervention/detail/includes/controls.html:19
 msgid "Run check"
 msgstr "Prüfung vornehmen"
 
-#: intervention/forms.py:413 konova/forms.py:389
+#: intervention/forms.py:414 konova/forms.py:389
 msgid ""
 "I, {} {}, confirm that all necessary control steps have been performed by "
 "myself."
@@ -873,30 +882,30 @@ msgstr ""
 "Ich, {} {}, bestätige, dass die notwendigen Kontrollschritte durchgeführt "
 "wurden:"
 
-#: intervention/forms.py:464
+#: intervention/forms.py:465
 msgid "Only recorded accounts can be selected for deductions"
 msgstr "Nur verzeichnete Ökokonten können für Abbuchungen verwendet werden."
 
-#: intervention/forms.py:483 intervention/forms.py:490
+#: intervention/forms.py:484 intervention/forms.py:491
 #: intervention/tables.py:88
 #: intervention/templates/intervention/detail/view.html:19
 #: konova/templates/konova/home.html:11 templates/navbar.html:22
 msgid "Intervention"
 msgstr "Eingriff"
 
-#: intervention/forms.py:485
+#: intervention/forms.py:486
 msgid "Only shared interventions can be selected"
 msgstr "Nur freigegebene Eingriffe können gewählt werden"
 
-#: intervention/forms.py:498
+#: intervention/forms.py:499
 msgid "New Deduction"
 msgstr "Neue Abbuchung"
 
-#: intervention/forms.py:499
+#: intervention/forms.py:500
 msgid "Enter the information for a new deduction from a chosen eco-account"
 msgstr "Geben Sie die Informationen für eine neue Abbuchung ein."
 
-#: intervention/forms.py:535
+#: intervention/forms.py:536
 msgid ""
 "Eco-account {} is not recorded yet. You can only deduct from recorded "
 "accounts."
@@ -904,7 +913,7 @@ msgstr ""
 "Ökokonto {} ist noch nicht verzeichnet. Abbuchungen können nur von "
 "verzeichneten Ökokonten erfolgen."
 
-#: intervention/forms.py:548
+#: intervention/forms.py:549
 msgid ""
 "The account {} has not enough surface for a deduction of {} m². There are "
 "only {} m² left"