Media issue - migrating from BU Exec to Arcserve

[Piloria]

I have just migrated from an old server using Symantec BU exec to a new server using Arcserve R16

the Tapes are in a GFS set

Is there a way for Arcserve to accespt the tapes from the old BU Exec cycle

I dont want to have to Format every tape before use (a large number are off site)
We have 6 sets of daily tapes (Monday - Thu) - 24 Tapes
26 Weekly Tapes
All month ends are never reused

if i forget to format them before use i dont want the BU to fail
and it would be 6 mnths before all the tapes in the cycle are used

When i do the Preflight Check i get
No suitable media is available
Ensure that * or any media in the scratch set of xxxx_DLY
or a blank media is mounted in the specified group

I have tried setting the following
Options - Backup Media
Overwrite Same media name, or blank media first , and then any media

In the Destination Tab
Media = *

and in Tape Engine
Use Global Scratch set is ticked

Once we have been through a full cycle i will change back

any help appreciated