NIC400 Axi4 Limit total number of outstanding transactions to 1

Hi, I have designed a Axi4 to Axi4 bridge connections via Nic400. I want my master side has only 1 outstanding transactions at a time either read or write, but not both at the same time. To do this I arranged (in the picture) total issuing to 1 with read iss and write iss to 1 as well. I expected this to prevent read and write outstanding transactions at the same time, but it did not help.  Can you help me about it, or is this possible ?