derivedDataType MtasDigitString1to3DT

EcimDerivedString with character class [0-9] and length (1..3) constraint.

References from:
MtasSdsServedHplmn; MtasSdsVplmn;
stringMtasDigitString1to3DT

Valid values: ^[0-9]{1,3}$
  derivedDataType MtasDigitString1to3DT