1 files changed, 5 insertions, 0 deletions
diff --git a/include/administration.hpp b/include/administration.hpp
index dffce89..68deb78 100644
--- a/include/administration.hpp
+++ b/include/administration.hpp
@@ -111,6 +111,10 @@ typedef struct
     time_t payment_on_account_date;
     char tax_representative[64];
     char corrected_sequential_number[16];
+
+    // Not stored.
+    contact supplier;
+    contact customer;
 } invoice;
 
 typedef struct
@@ -142,6 +146,7 @@ bool    administration_update_contact(contact data);
 u32     administration_get_contact_count();
 u32     administration_get_contacts(u32 page_index, u32 page_size, contact* buffer);
 contact administration_create_empty_contact();
+bool    administration_is_contact_valid(contact data);
 
 void    administration_cancel_project(project data);
 bool    administration_remove_project(project data);