Validation of DC_ChargeLoopReq fails due to (optional) message element 'DisplayParameters::ChargingComplete' of DC_ChargeLoopReq

[abilal-akkodis]

Current behaviour

Validation of DC_ChargeLoopReq in state DCChargeLoop fails due to message element DisplayParameters::ChargingComplete not used in request message

Expected behaviour

As per ISO 15118-20 section 8.3.4.5.5.2, both DisplayParameters and its sub-element ChargingComplete are defined as optional message elements. On the other hand, in the current implementation on master branch, ChargingComplete is defined as a mandatory message element, which causes the validation of DC_ChargeLoopReq message to fail.