For general information about message IEC161I, see the explanation for return code 001.

Specific information for this return code: An extend was attempted, but no secondary space allocation quantity was specified. See the discussion in Access Method Services for ICF, under the description for secondary space amount, for further details.

For the case of an Extended Format data set using a data class including 'Additional Volume Amount' set to secondary, the data class will have to be altered to set 'Additional Volume Amount' to primary and the data set redefined, or the data set must be redefined with a data class that does not include 'Additional Volume Amount' set to secondary, or the data set redefined to include a secondary space allocation.