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Since discovered that this is available in the &RECORG variable
Explanation from ISMF :
Use the RECORG field to specify the data set record organization you want to use in the simulated allocation.
Possible values:
KS VSAM Key Sequenced data set
ES VSAM Entry Sequenced data set
RR VSAM Relative Record data set
LS VSAM Linear Space data set
FS VSAM Linear zFS data set
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