invoice + some table name thing

common/src/proto/komp_ac.table_definition.rs

@@ -157,6 +157,12 @@ pub struct InvoiceTemplateFieldBinding {
     pub column_name: ::prost::alloc::string::String,
     #[prost(enumeration = "InvoiceTemplateAccountingRole", tag = "4")]
     pub accounting_role: i32,
+    /// Optional source reached through column_name when that column is a LINK.
+    /// Both names are empty for a value stored directly on the invoice table.
+    #[prost(string, tag = "5")]
+    pub source_table_name: ::prost::alloc::string::String,
+    #[prost(string, tag = "6")]
+    pub source_column_name: ::prost::alloc::string::String,
 }
 /// One physical dynamic table created for an invoice template scope. The root
 /// has an empty collection_path and parent_table_name. Each \[\] scope names its