diff --git a/ChangeLog b/ChangeLog
index 3f4d2bc3..33ce1eb2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -23801,3 +23801,6 @@
 	* Fixed a regression in rdlogedit(1) that caused a newly inserted
 	log event to be assigned the start time parameters of the previously
 	edited event.
+2022-12-13 Fred Gleason <fredg@paravelsystems.com>
+	* Added logic to the 'Edit Log Entry' dialog in rdlogedit(1) to
+	prevent entry of an invalid cart number.
diff --git a/rdlogedit/edit_event.cpp b/rdlogedit/edit_event.cpp
index d6aa2c38..ef04acdd 100644
--- a/rdlogedit/edit_event.cpp
+++ b/rdlogedit/edit_event.cpp
@@ -132,6 +132,12 @@ int EditEvent::exec()
 }
 
 
+void EditEvent::setOkEnabled(bool state)
+{
+  edit_ok_button->setEnabled(state);
+}
+
+
 void EditEvent::timeChangedData(const QTime &time)
 {
   if(edit_timetype_box->isChecked()) {
diff --git a/rdlogedit/edit_event.h b/rdlogedit/edit_event.h
index 6b6f7509..7a838b56 100644
--- a/rdlogedit/edit_event.h
+++ b/rdlogedit/edit_event.h
@@ -47,6 +47,7 @@ class EditEvent : public RDDialog
 
  protected:
   int exec();
+  void setOkEnabled(bool state);
   RDLogLine *logLine();
   void setLogLine(RDLogLine *ll);
   virtual bool saveData()=0;
diff --git a/rdlogedit/edit_logline.cpp b/rdlogedit/edit_logline.cpp
index 17d12ad8..67c87d4a 100644
--- a/rdlogedit/edit_logline.cpp
+++ b/rdlogedit/edit_logline.cpp
@@ -58,10 +58,13 @@ EditLogLine::EditLogLine(QString *filter,QString *group,QString *schedcode,
   // Cart Number
   //
   edit_cart_edit=new QLineEdit(this);
+  edit_cart_edit->setMaxLength(6);
   edit_cart_edit->setGeometry(10,138,60,18);
   QLabel *label=new QLabel(tr("Cart"),this);
   label->setFont(labelFont());
   label->setGeometry(12,122,60,14);
+  connect(edit_cart_edit,SIGNAL(textChanged(const QString &)),
+	  this,SLOT(cartNumberChangedData(const QString &)));
 
   //
   // Title 
@@ -138,6 +141,7 @@ int EditLogLine::exec(const QString &svcname,LogModel *model,
     edit_overlap_label->setEnabled(false);
   }  
   FillCart(logLine()->cartNumber());
+  cartNumberChangedData(edit_cart_edit->text());
 
   return EditEvent::exec();
 }
@@ -156,6 +160,15 @@ void EditLogLine::selectCartData()
 }
 
 
+void EditLogLine::cartNumberChangedData(const QString &str)
+{
+  bool ok=false;
+  unsigned cartnum=str.toUInt(&ok);
+
+  setOkEnabled(ok&&(cartnum>0)&&(cartnum<=RD_MAX_CART_NUMBER));
+}
+
+
 bool EditLogLine::saveData()
 {
   if(edit_cart_edit->text().isEmpty()) {
diff --git a/rdlogedit/edit_logline.h b/rdlogedit/edit_logline.h
index 09ce1fe6..a4626fc6 100644
--- a/rdlogedit/edit_logline.h
+++ b/rdlogedit/edit_logline.h
@@ -41,6 +41,7 @@ class EditLogLine : public EditEvent
 
  private slots:
   void selectCartData();
+  void cartNumberChangedData(const QString &str);
 
  protected:
   bool saveData();