Table Value not store in Field

I Create a table in [Field : JAPDesc] but that table value not store in this field..so please guide me.....

[Report: Subqty Name]
Form : Subqty Name
Object : Company

[Form: Subqty Name]
Part : FormSubTitle, noofqty
;Button : Delete All, Remove Line, Restore Line, Restore All,Report Operations
FullWidth : No
Height : 90% Screen
Background : @@SV_CHEQUE
SpaceRight : 0.5
SpaceLeft : 1.5
Local : Field : Form SubTitle : Info : $$LocaleString:"NO OF QTY"
Option : Small Size Form

[Part: noofqty]
Lines : PPP Subqty
Repeat : PPP Subqty:mydbSubqty
Break on: $$IsEmpty:$subqtyName
Scroll : Vertical
Height : 90% Screen


[Line: PPP Subqty]
Fields : PPPSubqty
Local : Field : Default : Delete : Border

[Field: PPPSubqty]
Use : Number Field
Storage : subqtyName
Unique : Yes
Width : 10

[System: UDF]
mydbSubqty : Aggregate: 997
subqtyName : Number : 1300

[Collection : subqtyCollection]
Type : mydbSubqty : Company
Childof : ##SVCurrentCompany
Format : $subqtyName, 10
Title : Sub Qty

[Field: JAP Desc]
Use : Number Field
Set as :$SubqtyName
Storage : JAPDesc
Style : Normal
Set Always : Yes
Width : 4
Table : subqtyCollection, not applicable
Show Table: Always
Key : Create Subqty Name

[Key: Create Subqty Name]
Key :Alt + C
Action: Alter: Subqty Name
[/CODE]

 

You should allocate the storage for JapDesc inside [system:udf].
And the main thing is you should add this field in the line where the context should be some object like voucher or stock item etc..