>If you want to avoid the duplicate key error, add !DELETED() to the filter of your index. Your primary or candidate index will then drop all the deleted records from the index.

but will it got problem on Table LInkage?!
on Index tag I put:

Name         Type           Expression
ItemKey      PrimaryKey     ItemKey And !Deleted()
...

I mean will it got problem on Inner Join?!
Or Simply I add like below:

Name         Type           Expression
ItemKey      NormalIndex     ItemKey
ItemKeyPK    PrimaryKey      ItemKey And !Deleted()
...

Since I am using Chinese Version VFP, the english word may wrong.
But I use first one to Join!?