ICE069A

Explanation
Critical.  For a  tape work data set sort or conventional
merge, the first byte of signed numeric data with leading separate
sign (that is, CSL or ASL data), or the last byte of signed numeric
data with trailing separate sign (that is, CST or AST), did not contain
a valid sign character of '+' (plus) or '-' (minus). 

System action
The program terminates.

Programmer response
Rerun the job with a SORTDIAG DD statement
to get message ICE800I, which indicates the reason Blockset could
not be used. If possible, remove the condition preventing the use
of Blockset.  Blockset treats a '-' (minus) sign as negative and any
other sign (for example, '+' (plus) or blank) as positive.  If you
must use tape work data sets or conventional merge, use '+' for all
of the positive signs in your CSL, CST, ASL and AST data.