Reason for creating custom identiy field group for ExperienceEvent schema

Issue in ./help/tutorial-comprehensive-technical/modules/datacollection/module1.2/ex2.md

Dear Team,

I was reading through **https://experienceleague.adobe.com/en/docs/platform-learn/tutorial-comprehensive-technical/datacollection/module12/ex2#what-does-this-customer-do** as part of the defining the ExperienceEvent schema to capture customer behavior, it mention some steps to create a custom field group to define an identity and mark ECID as primary identity.

In some other documentation
1. https://experienceleague.adobe.com/en/docs/platform-learn/getting-started-for-data-architects-and-data-engineers/model-data-in-schemas#create-web-events-schema

2. https://experienceleague.adobe.com/en/docs/platform-learn/implement-web-sdk/initial-configuration/configure-schemas

Its recommended to use special **identityMap** object and set the identities at client side via websdk.

Please clarify which version is correct? is it necessary to create custom ECID identity field group in ExperienceEvent Schema or its enough to set it via identiyMap object?

Thanks
Shrikant

Start with ./help/tutorial-comprehensive-technical/modules/datacollection/module1.2/ex2.md and compare its ECID field-group instructions with the two linked schema and Web SDK pages. Determine which approach is current and update or clarify the documentation so readers know whether a custom ECID identity field group is required when using identityMap; done means the conflicting guidance is resolved.

Written by the indexing model from the issue text.