Answer:
Your bank guarantees every endorsement on every check deposited to this account. If you allow a single entity to deposit checks to multiple payees (all DBA's) you assume a significant amount of risk. (You are also helping your customer avoid the charges it might incur if you required individual accounts.)
The only thing that would prevent your institution from allowing this is your own policies. The "Threads" have seen a fair number of conversations on this point and some banks do allow it... I would not.
First published on BankersOnline.com 7/4/11