If anyone has had a problem trying to use System Determined Blocksize with TSO 
RECEIVE and getting a message IEB1139W like:

IEB1139W THE OUTPUT DATA SET BLOCK SIZE IS BEING REDUCED FROM 32720 TO 27920 
BYTES.  ANY EXISTING PHYSICAL RECORDS LONGER THAN 27920 BYTES ARE FAT BLOCKS 
AND MAY CAUSE I/O ERRORS.

...because SDB was changing the blksize between the time RECEIVE allocated the 
file according to the DCB information in the INMR02 record in the XMIT file and 
the time IEBCOPY tries to open it, I've opened an RFE in the hopes that IBM 
will correct the problem.

Please consider watching and/or voting for RFE # 148961: TSO RECEIVE should 
correctly handle System Defined Blocksize = YES
at
http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=148961

Thanks for your support. 

Wendell

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