diff --git a/R/_funktionen/f_leer_from_tabelle.R b/R/_funktionen/f_leer_from_tabelle.R
new file mode 100644
index 0000000..c5c54d2
--- /dev/null
+++ b/R/_funktionen/f_leer_from_tabelle.R
@@ -0,0 +1,15 @@
+##
+## Datum: 2024-10-17_14-29 
+## Name: Christian Oswald
+## Projekt:  etatverwaltung
+## Datei:  f_leer_df_from_table.R
+## Kommentar: Erstellt einen leeren DS einer Tabelle
+##
+
+leer_df_from_table <- function(conn, tabelle){
+  felder <- dbListFields(conn, tabelle)
+  record <- data.frame(matrix(ncol = length(felder), nrow = 0)) 
+  colnames(record) <- felder
+  return(record)
+}
+
diff --git a/R/_funktionen/f_max_id.R b/R/_funktionen/f_max_id.R
new file mode 100644
index 0000000..d1390da
--- /dev/null
+++ b/R/_funktionen/f_max_id.R
@@ -0,0 +1,17 @@
+##
+## Datum    : 2026-03-09_15-47 
+## Name     : Christian Oswald
+## Datei    : f_max_id.R
+## Projekt  : gemfin-shiny
+## Kommentar: Ermittelt den maximalen id einer tabelle
+##
+
+## * Initialisierung ----
+
+max_id <- function(conn, tablle){
+  paste0("SELECT max(id) FROM ", tabelle) %>%
+    dbxSelect(conn,.) %>% 
+    pull
+}
+
+
diff --git a/R/accounts/accounts.R b/R/accounts/accounts.R
index 0cb0dd2..44158e3 100644
--- a/R/accounts/accounts.R
+++ b/R/accounts/accounts.R
@@ -5,9 +5,12 @@ read_accounts <-  function(conn){
 
 
 get_account_choices <- function(conn) {
-  tbl(conn, "accounts") |>
+  choices <- tbl(conn, "accounts") |>
     select(id, account_name) |>
     collect() |>
     arrange(account_name) |>
     (\(df) setNames(df$id, df$account_name))()
+  return(c("Kein Konto" = 0, choices))
 }
+
+
diff --git a/R/buchungen_mod.R b/R/buchungen_mod.R
index 5e6578e..244e1bf 100644
--- a/R/buchungen_mod.R
+++ b/R/buchungen_mod.R
@@ -3,7 +3,10 @@ buchungenUI <- function(id) {
   tagList(
     reactableOutput(ns("buchungen_table")),
     reactableOutput(ns("details_table")),
-    postingModuleUI(ns("posting_modal"))
+    postingModuleUI(ns("posting_modal")),
+    actionBttn(ns("add_trans"), "Transaktion hinzu", size = "sm", style = "material-flat", color = "warning"),
+    actionBttn(ns("add_trans"), "Transaktion Löschen", size = "sm", style = "material-flat", color = "danger"),
+    actionBttn(ns("add_detail"), "Detail hinzu", size = "sm", style = "material-flat", color = "success")
   )
 }
 
@@ -13,7 +16,8 @@ buchungenServer <- function(id) {
     ns <- session$ns 
     
     postings <- reactiveVal(read_buch_tabelle(conn))
-    
+    details <- reactiveVal()
+    tabelle_neu <- reactiveVal()
     # NEU: Eine reactive variable für die ID, die wir editieren wollen
     # current_entry_id <- reactiveVal(NULL)
     
@@ -25,24 +29,32 @@ buchungenServer <- function(id) {
       f_reactable(postings(), coldefs = coldef_entries_tabelle)
     })
     
-    # Modal zum editieren
+    # Buchungen und gegenbuchungen anzeigen
     selected <- reactive(getReactableState("buchungen_table", "selected"))
-    
     observeEvent(selected(), {
       idwert <-  postings()[selected(),"entry_id"] %>% pull
-      details <- read_buch_tabelle(conn, trans_id = idwert)
+      details(read_buch_tabelle(conn, trans_id = idwert))
       output$details_table <- renderReactable(
-        f_reactable(details, coldefs = coldef_entries_tabelle)
+        f_reactable(details(), coldefs = coldef_entries_tabelle)
       )
-      
     })
     
+    # Buchunge auswähle
     selected_det <- reactive(getReactableState("details_table", "selected"))
     observeEvent(selected_det(),{
       idwert <- postings()[selected(),"id"] %>% pull
-      postingModuleServer("posting_modal",conn, idwert)
+      tabelle_neu(postingModuleServer("posting_modal",conn, idwert))
+    })
+    # Buchungstail hinzufügen
+    observeEvent(input$add_detail, ignoreInit = T, {
+      trans_id <- idwert <- postings()[selected(),"entry_id"] %>% pull
+      post_id <- max_id(conn, "posting") + 1
+      tabelle_neu(postingModuleServer("posting_modal",conn, idwert, post_id + 1))
+    })
+    # Tabelle aktualisieren
+    observeEvent(tabelle_neu(), ignoreInit = T, {
+      details(read_buch_tabelle(conn, trans_id = idwert))
     })
-    
     
   })
 }
\ No newline at end of file
diff --git a/R/entry_edit_modal.R b/R/entry_edit_modal.R
index f681f89..6828ef1 100644
--- a/R/entry_edit_modal.R
+++ b/R/entry_edit_modal.R
@@ -3,15 +3,26 @@
 postingModuleUI <- function(id) {
   ns <- NS(id)
   tagList(
-
+    
   )
 }
 
 # --- MODUL SERVER ---
-postingModuleServer <- function(id, conn, idwert) {
+postingModuleServer <- function(id, conn, trans_id, post_id = NULL) {
   moduleServer(id, function(input, output, session) {
     ns <- session$ns # Wichtig für das Namespacing innerhalb des Modals
-    record <- read_posting(conn, idwert)
+    if(is.null(post_id)){
+      record <- read_posting(conn, trans_id)
+    }else {
+      wertstellung <- dbxSelect(conn, paste0("SELECT max(valuta) from Postings WHERE entry_id=", trans_id)) %>%
+        pull
+      record <- leer_df_from_table(conn, "postings")
+      record[1, "id"] <- post_id
+      record$entry_id <- trans_id
+      record$account_id <- 0
+      record$valuta <- wertstellung
+      record$booking_date <- wertstellung
+    }
     trans <- dbxSelect(conn, paste0("SELECT * FROM entries WHERE id=", record$entry_id))
     # Modal öffnen
     
@@ -21,12 +32,12 @@ postingModuleServer <- function(id, conn, idwert) {
       
       f_airdatepicker_UI(ns("valuta"), "Wertstellung", record$valuta),
       f_airdatepicker_UI(ns("buchungsdatum"), "Buchungsdatum", record$booking_date),
-      selectizeInput(ns("kontakt"), "Kontakt:",selected = trans$adress_id, choices = get_contact_choices(conn), width = "100%"),
+      selectizeInput(ns("kontakt"), "Kontakt:",selected = trans$contact_id, choices = get_contact_choices(conn), width = "100%"),
       selectizeInput(ns("konto"), "Kontoname:",selected = record$account_id, choices = get_account_choices(conn), width = "100%"),
       selectizeInput(ns("projekt"), "Projektname", selected = NULL, choices = get_project_choices(conn), width = "100%"),
       splitLayout(cellWidths = c("70%", "30%"), 
         numericInput(ns("amount"), "Betrag:", value = record$amount, width = "100%"),
-        numericInput(ns("coin_share_amount"), "Münzne:", value = record$coin_share_amount, width = "100%")
+        numericInput(ns("coin_share_amount"), "Münzen:", value = record$coin_share_amount, width = "100%")
       ),
       textAreaInput(ns("trans_notiz"), label= "Notiz (Transaktion)", value = trans$note, width = "100%"),
       splitLayout(cellWidths = c("50%", "50%"), 
@@ -36,16 +47,59 @@ postingModuleServer <- function(id, conn, idwert) {
       # 
       footer = tagList(
         modalButton("Abbrechen"),
-        actionButton(ns("confirm"), "Bestätigen", class = "btn-success")
+        actionBttn(ns("confirm"), "Bestätigen", style = "minimal", color = "success"),
+        actionBttn(ns("delete"), "Löschen", style = "minimal", color = "danger"),
+        splitLayout(cellWidths = c("50%", "50%"), 
+          numericInput(ns("bid"), "ID:", value = record$id),
+          numericInput(ns("trans_id"), "Trans_id:", value = record$entry_id)
+        ),
       ),
       easyClose = TRUE
     ))
     
     # Aktion beim Bestätigen
     observeEvent(input$confirm, ignoreInit = T, {
-      message("Eingabe im Modul ", id, ": ", input$user_name)
-      removeModal()
+      trans$contact_id <- input$kontakt
+      trans$note <- input$trans_notiz
+      record$amount <- input$amount
+      record$account_id <- input$konto
+      record$project_id <- input$projekt
+      record$valuta <- as.character(input$valuta)
+      record$booking_date <- as.character(input$buchungsdatum)
+      record$coin_share_amount <- input$coin_share_amount
+      record$receipt_id <- input$receipt_id
+      
+      # Check - Postings constraint
+      ## Entweder 1 oder 0 (neu)
+      anz <- dbxSelect(conn, paste0("SELECT count(id) FROM postings WHERE id=", record$id)) %>% pull 
+      ok <- anz <=1
+      ok <- !(is.na(record$entry_id) | record$entry_id == "") & ok
+      ok <- !(is.na(record$valuta) | record$valuta == "") & ok
+      ok <- !is.na(record$amount)
+      ok <- record$account_id > 0 & ok
+      
+      
+      if(ok) {
+        dbxUpsert(conn, "postings", records = record, where_cols = "id")
+        dbxUpsert(conn, "entries", records = trans, where_cols = "id")
+        removeModal()
+        return(reactive(input$confirm))
+      } else showNotification("Die Buchung enthält Fehler", type = "error")
+      
     })
+    
+    # Aktion Detail löschen
+    observeEvent(input$delete, ignoreInit = T, {
+      anz <- dbxSelect(conn, paste0("SELECT count(entry_id) FROM postings WHERE entry_id=", record$entry_id) ) %>% pull
+      if(anz>1){
+        dbxDelete(conn, "postings", where = data.frame(id=record$id))
+        removeModal() 
+        return(reactive(input$delete))
+      } else {
+        showNotification("Das ist der letzte Buchungsteil, er kann nicht gelöscht werden -> Transaktion löschen", type = "error")
+      }
+    })
+    
     # 
   })
 }
\ No newline at end of file
diff --git a/R/projects/projects.R b/R/projects/projects.R
index a46e282..eea3ac4 100644
--- a/R/projects/projects.R
+++ b/R/projects/projects.R
@@ -5,5 +5,5 @@ get_project_choices <- function(conn) {
     arrange(projektname)
   
   choices <- setNames(as.character(projekte$id), projekte$projektname)
-  c("-" = "", choices)
+  return(c("Kein Projekt" = 0, choices))
 }
diff --git a/db/development.sqlite b/db/development.sqlite
index 64a6c2c..2df833b 100644
Binary files a/db/development.sqlite and b/db/development.sqlite differ
diff --git a/global.R b/global.R
index cba5b65..1f3c2c1 100644
--- a/global.R
+++ b/global.R
@@ -19,5 +19,4 @@ options(shiny.error = browser)
 conn <- dbConnect(RSQLite::SQLite(), "db/development.sqlite")
 sourceDirectory("R/")
 
-dbReadTable(conn, "projects") %>% str
-dbGetQuery(conn, "PRAGMA table_info(postings);")
+