Using a variable to set device value

Hello There, I´m configuring wallbox EV charger to dynamically set the max charge to use based on available Amp at home. in order to do that, first I need to know how much available amp do I have, but this is something already got in a sensor called sendor.carga_wallbox.

what I´m missing now is in an automation to set this sensor value to wallbox max charge, I created this automation:
</
alias: Wallbox a 17
description: “”
trigger:

• platform: numeric_state
  entity_id:
  • sensor.acometida_amp
    above: 20
    condition:
    action:
• device_id: 91bc1fbd644674d94abcfc589634d9be
  domain: number
  entity_id: b6564c42c5fba3711507b469621ed3d8
  type: set_value
  value: {{ sensor.carga_wallbox }}
  mode: single
  />

When sensor Acometida is below 20 I want to set the value for this entity which is sensor.wallbox_commander_2_sn_755800_corriente_de_carga_maxima

But error receive is this one:
Message malformed: expected float for dictionary value @ data[‘value’]

Anybody having such or similar experience¿

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