Tdl For Tally Erp 9

Problem: You need to track whether a sale was shipped by Air, Road, or Rail.

Solution TDL Code:

[System: UDF]
    Add : Voucher Type : Sales : VoucherEntry : Field : Vch_transport
[Voucher Type: Sales]
Set : VoucherEntryField = TransportField
[Field: TransportField]
Use : Field.Default
Name : Vch_transport
Caption : "Mode of Transport"
Type : String
Table : "Air", "Road", "Rail"
Storage : Vch_transport_storage
[Storage: Vch_transport_storage]
Persistant : Yes
Type : String

Result: When you open a sales voucher in Tally ERP 9, a new dropdown appears asking for "Mode of Transport". This data gets saved with the voucher and can be printed. tdl for tally erp 9

Let’s look at two real-world scenarios where TDL solves problems.

Before you write your first line of code, you need to understand the hierarchy. TDL is not a linear script like Python; it is a collection of Objects.

The four primary objects in TDL are:

The TDL Execution Flow:

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Tally ERP 9 has a built-in debugger.

Tally Definition Language (TDL) is a metadata-driven, XML-like scripting language used exclusively within the Tally ecosystem. Think of it as a "skin and logic" modifier. TDL files (usually with .txt or .tdl extensions) are loaded into Tally ERP 9 at runtime. Problem: You need to track whether a sale

When Tally ERP 9 starts, it reads its internal object definitions. But if you load a TDL file, Tally overrides or extends those definitions based on your instructions. This means you can:

The most important thing to know: No TDL code runs unless explicitly loaded. Tally ERP 9 will work perfectly without it, but TDL unlocks its true adaptive potential.

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Verdict: TDL is the "secret sauce" that transforms Tally.ERP 9 from a rigid accounting software into a flexible, industry-specific business management solution. While it requires technical expertise to master, it is arguably the single biggest reason for Tally's dominance in the Indian market.

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Create StockMRP.tdl:

[Report: Stock Item MRP]
   Title : "Stock Items with MRP"
   Type : Report
   Collection : Coll_StockItems
[Collection: Coll_StockItems]
Type : StockItem
Fetch : Name, MRP, OpeningBalance
[Part: Part_StockItemMRP]
Line : Line_ItemMRP Result: When you open a sales voucher in
[Line: Line_ItemMRP]
Fields : Fld_Name, Fld_MRP
[Field: Fld_Name]
Use : Name Field
Set as : $Name
[Field: Fld_MRP]
Use : Numeric Field
Set as : $MRP
Title : "MRP"

After loading, you’ll find the report under Gateway of Tally → Display → Stock Item MRP.

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