Batch Number Details Import Issue

Dear Expert

I crated User defined field to Batch Details field

My All Items are Batch Number wise

NOw i want to import data fronm Excel to create Backdated Purchase Bill ,So i use

1)Document Level Template

2) Document Line Template

3) BTNT-BatchNubers1 Template

When i create CSV sheet for Batch number I add user defined field also

& when i import through DTW & select the Batch Number Template & Go to the Mapping Rule for User defined field it can't see in Target Field

So how i import Batch Number details for Userdefiend field

SAP 8.82 PL 06