diff --git a/src/Layers/CH/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al b/src/Layers/CH/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
index 9fb3aae5970..6745ae243f1 100644
--- a/src/Layers/CH/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
+++ b/src/Layers/CH/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
@@ -1225,11 +1225,14 @@ page 508 "Blanket Sales Order Subform"
     end;
 
     local procedure UpdateTypeText()
+    var
+        RecRef: RecordRef;
     begin
         if not TypeAsTextFieldVisible then
             exit;
 
-        TypeAsText := Rec.FormatType();
+        RecRef.GetTable(Rec);
+        TypeAsText := TempOptionLookupBuffer.FormatOption(RecRef.Field(Rec.FieldNo(Type)));
     end;
 
     /// <summary>
diff --git a/src/Layers/CH/Tests/Misc/OptionLookupBufferTest.Codeunit.al b/src/Layers/CH/Tests/Misc/OptionLookupBufferTest.Codeunit.al
index a3fec1db677..1b3c44696c1 100644
--- a/src/Layers/CH/Tests/Misc/OptionLookupBufferTest.Codeunit.al
+++ b/src/Layers/CH/Tests/Misc/OptionLookupBufferTest.Codeunit.al
@@ -244,6 +244,36 @@
         until TempOptionLookupBuffer.Next() = 0;
     end;
 
+    [Test]
+    [Scope('OnPrem')]
+    procedure BlanketSalesOrderSupportsLongLineTypeCaption()
+    var
+        Customer: Record Customer;
+        SalesLine: Record "Sales Line";
+        OptionLookupBufferTest: Codeunit "Option Lookup Buffer Test";
+        BlanketSalesOrder: TestPage "Blanket Sales Order";
+        LineTypeCaption: Text[30];
+    begin
+        // [SCENARIO 644921] A line type caption longer than 20 characters can be selected on a blanket sales order
+        Initialize();
+
+        // [GIVEN] A custom line type with a long caption and a blanket sales order
+        BindSubscription(OptionLookupBufferTest);
+        LineTypeCaption := Format(SalesLine.Type::Test_Custom1);
+        Assert.IsTrue(StrLen(LineTypeCaption) > 20, 'The test line type caption must be longer than 20 characters.');
+        LibrarySales.CreateCustomer(Customer);
+        BlanketSalesOrder.OpenNew();
+        BlanketSalesOrder."Sell-to Customer Name".SetValue(Customer.Name);
+
+        // [WHEN] Selecting the custom line type
+        BlanketSalesOrder.SalesLines.First();
+        BlanketSalesOrder.SalesLines.FilteredTypeField.SetValue(LineTypeCaption);
+
+        // [THEN] The complete caption is displayed
+        BlanketSalesOrder.SalesLines.FilteredTypeField.AssertEquals(LineTypeCaption);
+        BlanketSalesOrder.Close();
+    end;
+
     [Test]
     [Scope('OnPrem')]
     procedure SalesInvoiceSubtypeAutoComplete()
diff --git a/src/Layers/NA/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al b/src/Layers/NA/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
index 1c5a2c6d5e0..73daf8e33d2 100644
--- a/src/Layers/NA/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
+++ b/src/Layers/NA/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
@@ -1221,11 +1221,14 @@ page 508 "Blanket Sales Order Subform"
     end;
 
     local procedure UpdateTypeText()
+    var
+        RecRef: RecordRef;
     begin
         if not TypeAsTextFieldVisible then
             exit;
 
-        TypeAsText := Rec.FormatType();
+        RecRef.GetTable(Rec);
+        TypeAsText := TempOptionLookupBuffer.FormatOption(RecRef.Field(Rec.FieldNo(Type)));
     end;
 
     /// <summary>
diff --git a/src/Layers/NO/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al b/src/Layers/NO/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
index 01b1d2089da..a7faf6868ea 100644
--- a/src/Layers/NO/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
+++ b/src/Layers/NO/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
@@ -1228,11 +1228,14 @@ page 508 "Blanket Sales Order Subform"
     end;
 
     local procedure UpdateTypeText()
+    var
+        RecRef: RecordRef;
     begin
         if not TypeAsTextFieldVisible then
             exit;
 
-        TypeAsText := Rec.FormatType();
+        RecRef.GetTable(Rec);
+        TypeAsText := TempOptionLookupBuffer.FormatOption(RecRef.Field(Rec.FieldNo(Type)));
     end;
 
     /// <summary>
diff --git a/src/Layers/W1/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al b/src/Layers/W1/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
index 20938057f3a..a735d28057f 100644
--- a/src/Layers/W1/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
+++ b/src/Layers/W1/BaseApp/Sales/Document/BlanketSalesOrderSubform.Page.al
@@ -1217,11 +1217,14 @@ page 508 "Blanket Sales Order Subform"
     end;
 
     local procedure UpdateTypeText()
+    var
+        RecRef: RecordRef;
     begin
         if not TypeAsTextFieldVisible then
             exit;
 
-        TypeAsText := Rec.FormatType();
+        RecRef.GetTable(Rec);
+        TypeAsText := TempOptionLookupBuffer.FormatOption(RecRef.Field(Rec.FieldNo(Type)));
     end;
 
     /// <summary>
diff --git a/src/Layers/W1/Tests/Misc/MockSalesLineTypeCustom.EnumExt.al b/src/Layers/W1/Tests/Misc/MockSalesLineTypeCustom.EnumExt.al
index 9c8ec905881..dbb4daabde7 100644
--- a/src/Layers/W1/Tests/Misc/MockSalesLineTypeCustom.EnumExt.al
+++ b/src/Layers/W1/Tests/Misc/MockSalesLineTypeCustom.EnumExt.al
@@ -2,7 +2,7 @@ enumextension 134645 "Mock Sales Line Type - Custom" extends "Sales Line Type"
 {
     value(134645; Test_Custom1)
     {
-        Caption = 'Test_Custom1';
+        Caption = 'Test Long Line Type Caption', Locked = true;
     }
     value(134647; Test_Custom2)
     {
diff --git a/src/Layers/W1/Tests/Misc/OptionLookupBufferTest.Codeunit.al b/src/Layers/W1/Tests/Misc/OptionLookupBufferTest.Codeunit.al
index 41456338359..4713230cf07 100644
--- a/src/Layers/W1/Tests/Misc/OptionLookupBufferTest.Codeunit.al
+++ b/src/Layers/W1/Tests/Misc/OptionLookupBufferTest.Codeunit.al
@@ -244,6 +244,36 @@ codeunit 134645 "Option Lookup Buffer Test"
         until TempOptionLookupBuffer.Next() = 0;
     end;
 
+    [Test]
+    [Scope('OnPrem')]
+    procedure BlanketSalesOrderSupportsLongLineTypeCaption()
+    var
+        Customer: Record Customer;
+        SalesLine: Record "Sales Line";
+        OptionLookupBufferTest: Codeunit "Option Lookup Buffer Test";
+        BlanketSalesOrder: TestPage "Blanket Sales Order";
+        LineTypeCaption: Text[30];
+    begin
+        // [SCENARIO 644921] A line type caption longer than 20 characters can be selected on a blanket sales order
+        Initialize();
+
+        // [GIVEN] A custom line type with a long caption and a blanket sales order
+        BindSubscription(OptionLookupBufferTest);
+        LineTypeCaption := Format(SalesLine.Type::Test_Custom1);
+        Assert.IsTrue(StrLen(LineTypeCaption) > 20, 'The test line type caption must be longer than 20 characters.');
+        LibrarySales.CreateCustomer(Customer);
+        BlanketSalesOrder.OpenNew();
+        BlanketSalesOrder."Sell-to Customer Name".SetValue(Customer.Name);
+
+        // [WHEN] Selecting the custom line type
+        BlanketSalesOrder.SalesLines.First();
+        BlanketSalesOrder.SalesLines.FilteredTypeField.SetValue(LineTypeCaption);
+
+        // [THEN] The complete caption is displayed
+        BlanketSalesOrder.SalesLines.FilteredTypeField.AssertEquals(LineTypeCaption);
+        BlanketSalesOrder.Close();
+    end;
+
     [Test]
     [Scope('OnPrem')]
     procedure SalesInvoiceSubtypeAutoComplete()