Update: Lock/Unlock ID Mapping in Internal Fields
ID field in Internal Fields will now be locked by default.
It is being implemented for better user safety and smooth operation of the application. However, it will also be possible to change the ID in the Internal Fields mapping, if you unlock it first.
Why is this important?
It is important to have this field blocked in Internal Fields, because if you decide to change it, Google Analytics may no longer work correctly.
Of course, we'd like to give you the freedom of choice, so we have decided to implement an option of changing the ID.
Yet to change the mapping of ID in Internal Fields, you need to unlock it first. This is intended to prevent any issues resulting from ID change.
And because we enhance Google Analytics with a custom dimension using this ID, if you change it, your product data continuity will be broken. As a result, our Analytics module may not be able to collect historical data.