The square brackets [] need to be quoted or escaped, as they are metacharacters for the case matching. It basically uses the same patterns as for file globbing (wildcards).
Also I don't think you can group substring alternatives inside parentheses.
Try this.
Code:
case $chl in
'[SM.APPLE_SWIFT_@AL]' | '[SM.APPLE_SWIFT_@DS]' | '[SM.APPLE_SWIFT_@DU]' | '[SM.APPLE_SWIFT_@DV]DV)]')
... etc
