OK, I finallly duplicated a V285.
MA=1020 SC=NA CC=105 CT=13.02 (these are valid MA, CC & CT codes)
If you do not know the MA or CT that the mobile will be located in then your entries should be:
MA= NA SC=18 (appropriate code) CC=105 (appropriate code) CT=NA This should eliminate your error.
If you do know the MA, CC and CT then you should be able to find the SC and have a complete entry.
Hope this helps.
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The opinions expressed are mine and they are not to be taken as legal advice.