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Why I can only create 3 Tx buffer in Flexray Node

I created two FlexRay nodes, and Node2. Node1

       In the Node1 project, I created 3 to TX buffer to send the data of from Node1 , and also created 3 RX Buffer for receiving data from the Node2.

Similarly, in the Node2 node, created 3 TX Buffer to send the data from Node2  and 3 RX buffer to receive data from Node1.

But I found that when I  increase  the TX buffer to 4 in Node1, can only receive 3 previous buffer data in Node2, fourth RX buffer received   data is from Node1's tTX Buffer1.

and in Node2  can only receive a front two buffer from Node2 ’ buffer data.

Does anyone know why?

Thank you very much!