Version 2 (-V2)
Use the Version 2 adapter command (-V2) to set all message descriptor and option structure version fields to _VERSION_1, which corresponds to IBM® MQ version 2.x.
-V2
If the Version 2 adapter command (-V2) is not specified, the default is _VERSION_2, which corresponds to IBM® MQ version 5.x.
The Version 2 adapter command (-V2) is used with sources and targets.
If the Header adapter command (-HDR) is used in conjunction with the Version 2 adapter command (-V2), then the version information mapped in the header is ignored.