Specifying the associated data data set: SYSADATA

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Define the data set that contains your associated data output with the SYSADATA DD statement: 
//SYSADATA DD   DSN=dsname,UNIT=SYSALLDA,
//              SPACE=(subparms),DISP=(MOD,PASS)

The associated data data set contains information regarding the assembly. It provides information for use by symbolic debugging and cross-reference tools. The SYSADATA data set must be directed to an intermediate storage device capable of sequential access.

The recommended minimum LRECL for the SYSADATA data set is 8188.