Composer replica and OS VM auto deleted

HI

   I build a composer Pool to deliver Win7 ...Because I only has a 1TB HD...so I set replica/OS/Persistent disk to the same disk....

then I moditor provisioning status from VI Client....I find replica VM created well, then do " Clone virtual Machine(Replica)", then "Add Tag", then auto delete replica and linked-clone VM

I try to 3 times...get the same result...if I have some step or action misconfigured ?

thanks!!