Update Total Units

{
  "name": "update_total_units",
  "desc": "Update D-ASA total_units",
  "readonly": false,
  "args": [
    {
      "type": "uint64",
      "name": "total_units",
      "desc": "D-ASA total units"
    }
  ],
  "returns": {
    "type": "uint64",
    "desc": "Timestamp of the update"
  },
  "errors": [
    {
      "code": "UNAUTHORIZED",
      "message": "Not authorized"
    },
    {
      "code": "DEFAULTED",
      "message": "Defaulted"
    },
    {
      "code": "SUSPENDED",
      "message": "Asset operations are suspended"
    },
    {
      "code": "PENDING_COUPON_PAYMENT",
      "message": "Pending due coupon payment"
    }
  ]
}

The call MUST fail with the UNAUTHORIZED error code if not called by an authorized caller.

The call MUST fail with the DEFAULTED error code if the asset is defaulted.

The call MAY fail with the SUSPENDED error code if the asset is suspended.

The call MUST fail with the PENDING_COUPON_PAYMENT error code if there is any due coupon still to be paid.