Originally Posted by TerryK

Sounds like his/her client paid for the B fare ticket. B fare is a very high fare. It is in the $3500 range without min/max stay requirement. Nested ticket should pose no problem as he/she is not trying to circumvent restrictions. However, it would have been different if the OP were to upgrade to a Z fare, which is only a few hundreds higher each way, with loads of restrictions.