MRP column in sales invoice

Dear experts ,
I am learning TDL with the help of some book and online .

i am trying to create tdl MRP in inventory info ... stock itme info.. same MRP to be used in sales voucher.. i am getting error as storage in inventory is not picking up both sales voucher as printing. kindly help in rectifying error,,Pl find following code. for the

[#Part: STKI Batch]
Add:Lines:TMMSTMRP

[Line: TMMSTMRP]
Fields:Medium Prompt,TMMSTMRP
Local:Field:Medium Prompt:Set as : $$LocaleString:"MRP ?"
Space Top : 1

[Field : TMMSTMRP]
Use : Number Field
Storage : TMMRP

[#Line:EI ColumnOne]
Add : Right Field : Before : VCH QtyTitle : TMPACKMRP
Local : Field : TMPACKMRP : INFO : " MRP "
Local : Field : TMPACKMRP : ALIGN : Center

[#Line:EI InvInfo]
add : right field : after : VCH ActualQty :TMPACKMRP

[Field : TMPACKMRP]
use : Number field
Type : Number : Forced:
Storage :TMMSTMRP
Set always : yes
Width : 15
Align : Center
Format : " No Comma, Decimal:2"
invisible : not@@ISSALES @@ISSALESORDER

[System : UDF]
TMMSTMRP : NUMBER : 6000

[#Line: ExpInv Column1]
Add : left Field : After :EXPINV DescTitle : TMPACKMRP
Local : Field : TMPACKMRP : Info : " MRP"
Local : Field : TMPACKMRP : Delete : Storage
Local : Field : TMPACKMRP : Type : String
Local : Field : TMPACKMRP : align : Center

[#Line :ExpInv InvDetails]
add : left Fields : after : EXPINV Desc :MRPPRINT
[ Field : MRPPRINT]
use : Number Field
Set as :$TMMSTMRP
Set Always : Yes
Width : 10
Align : Center
Format : "No Comma, Decimal:2"
Border : Thin Left



The above code is working but storage in Inventory Info , not picking in Sales Voucher

 

dear learned please help.. as need urgently..

Set as :$TMMSTMRP not picking the UDF..

thank