If the output records do not appear to contain the same data as the input records, and either E15 or E35 has been used, check that your routine is handling register 1 correctly; especially, check that it is correct on return to DFSORT. If, for example, you first load register 1 and then restore all registers (including register 1), register 1 probably has the wrong contents.

Also, if you first restore all registers and then try to load register 1 from a changed base register, you might pass the wrong information to DFSORT.