FPEC2873E IDENTIFIER `<V1>` IS NOT ALLOWED. A SORT FIELD IDENTIFIER HAS ALREADY BEEN SPECIFIED. THE SORT FIELD HAS TO BE THE LAST PARAMETER IN THE SORTBY OPTION.

Explanation
 The specified identifier is not valid because
a sort field has already been specified. The sort field is always
the last value specified with the SORTBY option.

User response
 Correct the SORTBY option of the BPACTIVITY command
so that the order identifiers are listed first and the sort field
is the last value.