diff --git a/backend/datasources/dummy.py b/backend/datasources/dummy.py
index 9a47af2..959c4a7 100644
--- a/backend/datasources/dummy.py
+++ b/backend/datasources/dummy.py
@@ -10,6 +10,7 @@
     ContractNotExists,
     UnauthorizedAccess,
     NoSuchUser,
+    NoSuchInvoice,
     NoDocumentVersions,
 )
 
@@ -210,10 +211,31 @@ def dummy_installation_details(username: str, contract_number: str) -> Installat
         ))
     return InstallationDetailsResult(**ns.load('frontend/src/data/dummyinstallationdetail.yaml'))
 
+invoice_pdf_exceptions = {
+    e.__name__: e
+    for e in [
+        UnauthorizedAccess,
+        NoSuchUser,
+        NoSuchInvoice,
+        ErpValidationError,
+        # TODO: ErpConnectionError,
+        # TODO: ErpUnexpectedError,
+    ]
+}
+
 def dummy_invoices(username: str) -> list[Invoice]:
     return [
         Invoice(**invoice)
         for invoice in ns.load('frontend/src/data/dummyinvoices.yaml')
+    ]+[
+        Invoice(
+            invoice_number=name,
+            contract_number='10002',
+            emission_date='2020-01-01',
+            first_period_date='2020-01-01',
+            last_period_date='2020-01-01',
+            amount=200,
+        ) for name in invoice_pdf_exceptions.keys()
     ]
 
 def pdf_content(invoice_number):
@@ -231,6 +253,11 @@ def pdf_content(invoice_number):
         return output.getvalue()
 
 def dummy_invoice_pdf(username: str, invoice_number: str):
+    if invoice_number in invoice_pdf_exceptions:
+        raise invoice_pdf_exceptions[invoice_number](dict(
+            code=invoice_number,
+            error=f"{invoice_number} (Dummy error)",
+        ))
     base64_data = base64.b64encode(Path('/usr/share/doc/tig/manual.pdf').read_bytes())
     base64_data = base64.b64encode(pdf_content(invoice_number))
     return InvoicePdf(
diff --git a/backend/datasources/erp.py b/backend/datasources/erp.py
index f414ded..675c13b 100644
--- a/backend/datasources/erp.py
+++ b/backend/datasources/erp.py
@@ -21,6 +21,7 @@
     ContractNotExists,
     UnauthorizedAccess,
     NoSuchUser,
+    NoSuchInvoice,
     NoDocumentVersions,
 )
 from .dummy import dummy_invoice_pdf
@@ -36,6 +37,7 @@ def catch_validation_error():
     ContractNotExists,
     UnauthorizedAccess,
     NoSuchUser,
+    NoSuchInvoice,
     NoDocumentVersions,
 ]
 def process_erp_errors(erp_response):
diff --git a/backend/datasources/exceptions.py b/backend/datasources/exceptions.py
index cfa0923..e636b49 100644
--- a/backend/datasources/exceptions.py
+++ b/backend/datasources/exceptions.py
@@ -39,5 +39,8 @@ class UnauthorizedAccess(ErpError):
 class NoSuchUser(ErpError):
     pass
 
+class NoSuchInvoice(ErpError):
+    pass
+
 class NoDocumentVersions(ErpError):
     pass