Cannot duplicate more than 1 TB from VTL to Tape Library

Hi All,

I have question about duplicate from VTL to Tape Library, our customer using Symantec Netbackup 7.6 and we configure SLP to duplicate from VTL to Physical Tape Library...But we have problem when we try to replicate more than 1 TB data from VTL, if data below 1TB we can duplicate data from VTL to physical tape library successfully...

Error like this,

"Amount of data read does not match the remaining fragment kbytes" and exiting status 85....

I'm using restorer L-180 and LTO5 in VTL DD and physical tape library using LTO6...Anybody have same experience like this?, because symantec support tell us to check in VTL but do not say which one I should check...Thank you before