DMA CC error interrupt accepted when doing a McBSP DMA transfer

I am using McBSP configurde to DMA mode on the L138. Every buffer TX causes a DMA CC error interrupt. The reason is that the DMA slot is linked to a null DMA transfer, and when the last word is transmitted, additional hardware event is generated to this null transfer. This situation generates a DMA CC error conditions. In order to solve this behaviour the slot should be linked to a dummy transfer of 0 bytes (this is the slot accepted by edma_alloc_slot  with EDMA_SLOT_ANY parameter) instead of a null transfer.