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When converting from an autonumber field to a text field, data can be lost because autonumber fields generate unique sequential values automatically for each record. These values are numeric and function specifically within that framework. When you perform the conversion, any unique characteristics of the autonumber may not directly transfer into the text format, leading to potential incompatibility or a mismatch in how that data is represented.

Moreover, text fields do not have the same constraints or behaviors as autonumbers, which could lead to issues when trying to reconcile existing autonumber data with the expected input for a text field. The unique incrementing nature of autonumber values can also mean that once the conversion takes place, existing references tied to the autonumber format may no longer function correctly, causing data loss or corruption in processes reliant on those identifiers.

While converting data types in Salesforce is often straightforward, specific conversions—like from autonumber to text—should be approached with caution and thorough data backups to mitigate any risk of loss during the process.