Controlling area currency copied to cost condition: DP90/91

In my example, the transaction currrency is 0 USD but the CO area currency is -15.09 AUD. I can see that after running DP90, the controlling area currency has been picked up.

When I checked ODP1 for transaction currency characteristic, the 'No summarization' has been checked. So it should have picked the transaction currency. But it is picking the CO currency. Is this so because cost in Trans currency is 0 and zero cost cannot be transferred to a cost condition?