Can't xfer characters?

That would depend, Vitiman.

If you are attempting to transfer a character between Battle.net accounts that are both registered to you and the one Battle.net is newly created there is a 30 day cooldown period for transfers.

http://us.blizzard.com/support/article.xml?locale=en_US&articleId=26163

Otherwise, we only allow the transfer of characters between accounts that are registered to the same user. This is what denotes ownership of an account, not who pays for it but who is registered to it.

http://us.blizzard.com/support/article.xml?locale=en_US&articleId=20558

Now, if you are the registered user on both accounts and this isn't a recently created Battle.net account with a recently merged WoW account the issue may be an error with one of the names on the account (i.e. a typo).

If that is the case you should be able to contact our Billing and Account Services department they may be able to help.

You can call 1 (800) 592 5499 (1-800-59-BLIZZARD) 7AM-8PM (PST/PDT) for live representation.
Australian users should please call 1-800-041-378 if the standard 800 line does not work.

Assuming you are transferring to or from this account... if you can give me the name and realm of a character on the other account I can take a look.