Decreasing the blocking factor can cause the record length (RECSIZE) of the source file to exceed the block size of the target file.
Fixed record length (RECFORM=F)
PAMCONV checks the record length of the source file and compares it with the record length of the target file, calculated from the block size of the target file. If the record length of the source file is greater than that of the target file, processing is aborted with a message.
Variable or undefined record length (RECFORM=V/U)
PAMCONV assumes that the record length of the target file is not exceeded and starts processing. If the record length of the target file is nevertheless exceeded, DMS informs PAMCONV and processing is aborted with a message.
Increasing the blocking factor does not cause any problems relating to the record length of the target file.