Transaction system affinity
A transaction system affinity is an affinity between a transaction and a particular CICS® region, it is not an affinity between transactions. It is caused by the transaction interrogating or changing the properties of the CICS region.
Transactions with an affinity to a particular CICS region, rather than to another transaction, are not eligible for dynamic transaction routing. Typically, they are transactions that use CICS SPI commands, such as EXEC CICS INQUIRE or SET, or that depend on global user exit programs.