I started using KoboCollect rather than ODK, i only switched to ODK recently due to a new error i was getting in Kobo (on a form which previously worked) with a nested repeat. When i switched to ODK, the nested repeat issue was resolved but i started getting an error with the calculated fields.
I have a working instance of the form still running on KoboCollecct 1.14.0a. The form was developed in xls. If i try deploy the same form as the one running to a new project in Kobo i get the error of 'Binding path [null] not allowed with parent binding of .......' this is in the same version of Kobo i had previously running v1.14.0a.
The same form is still currently running in Kobo on the tablets i originally set up. I have just tried kobo again and same error with trying to run the form. I get the same error in ODK v 15.0; ODK v1.16.2; ODK v1.17.2;
I switched to ODK and this error went away, but now i am getting the issue with the calculate fields.
ODK V1.18.0 the form works but the calculate field no longer works as in all later versions.
The original form (and running on kobo already on tablets) deploys in kobotoolbox. In Kobo collect it still gives me the binding path error. In ODK collect the form runs but the calculate fields do not work.
I do not know what else to try, the select-at() may work if someone can assist with the syntax to link with indexed repeat.