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Change of participant selections broken / won't save

  • Enable tax-receipting, add a tax account, set the tax to x%
  • Setup taxcalculator
  • Create an event in Quebec
  • Register a contact to that event (front or backend, doesn't matter)
  • In the backend: edit the registration and click Change Selections

The Change Registration Selections form is loaded with the following js error:
Uncaught Error: Syntax error, unrecognized expression: #crm-container # and the form cannot be saved.

Debugging:

https://lab.civicrm.org/extensions/taxcalculator/-/blob/master/templates/CRM/Taxcalculator/select_province.tpl#L149:

var id_input_province = CRM.taxcalculatorGetStateProvinceFieldID();
var prov_field = $('#crm-container #' + id_input_province);

taxcalculatorGetStateProvinceFieldID() (OR taxcalculatorGetStateProvinceOrCountryFieldID('state_province')) does not return an id and the next line produces an error

... because there is no province field present in the Change Registration Selections form ?