According to the DDS manual there may be a few issues.
The field containing CNTFLD keyword must be input-capable / data type A.
It cannot be defined in a subfile.
These keywords cannot be be used on same field:
AUTO (RAB, RAZ)
CHECK(AB, MF, RB, RZ, RLTB)
The field must have at least 2 spaces separating it from other fields.
Option indicators are not valid.