I recall similar experiences with x'00' in my JCL and it never worked; going 
back at least to XA.


 On Tue Mar 20 13:20 , 'JONES, CHARLIE' <[EMAIL PROTECTED]> sent:

>We are on z/OS 1.7 - This morning we had a JCL error and determined that
>the cause was
>An x'00' (null) between a STEPNAME and its corresponding EXEC directive.
>We changed 
>The null to a x'40' (space) and everything worked fine.  The programmer
>that created the JCL
>Claims that the JCL with the embedded null worked okay under z/OS 1.4
>during testing.  I'm
>Not sure I believe that.  Anyone with knowledge of the effect of nulls
>in JCL and any behaviorial
>Changes between z/OS 1.4 to z/OS 1.7.
>
>Charlie
>
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