Physical cash pool with bank initiated sweeps using sweep program automation for bank accounts owned

Hello all,

We currently have physical cash pools setup for bank accounts owned by the same legal entity (LE).  We use the sweep generation program to automated the Bank Account Transfer (BAT) and cashflow accounting. 

Now, we would like to perform internal bank transfers to support the cash needs across various LE.  Is this automation possible by setting up new physical cash pool?  What additional setups are required if this is in fact feasible?  

With a quick manual Bank Account Transfer (BAT) test of cross LE, the following error is thrown: The Intercompany account generated by the Intercompany Balancing Rules is invalid.