On Tue, 9 Dec 2025 01:19:49 +0000, rpinion865 <[email protected]> wrote:

>Unfortunately, we cannot enter the block size at the "prompt", since the
>whole sequence of events happens through the ISV's generated REXX EXEC.

TSO RECEIVE and TRANSMIT have user exits that you should be able to change the 
dataset allocation which are available as DYNALLOC text units. 

Alternatively, you could see if SMS can modify the blocksize.

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