Yes it can, what you need to do is adjust the banking setting inside MYOB.
So if you open MYOB:
1. Click the setup menu
2. Click the preferences item
3. Click the banking tab
4. Make sure that "When I receive money. I prefer to group it with other deposited funds." is ticked.
That should be it - any future payments raised in MYOB from ServiceM8 will arrive in undeposited funds.